Error when attempting to run mod

[Jakeob]

When I attempt to run the mod from my client, the following error occurs:

Quote

The game crashed whilst there was a severe problem during mod loading that has caused the game to fail
Error: net.minecraftforge.fml.common.LoaderException: java.lang.NoSuchMethodError: net.minecraft.command.CommandHandler.registerCommand(Lnet/minecraft/command/ICommand;)Lnet/minecraft/command/ICommand;

Interestingly enough, I have no errors when attempting to run it via the runClient script.

This is the only line in which I call the registerCommand method:

        ClientCommandHandler.instance.registerCommand(new TestSidebarScoresCommand());

I don't understand why this would happen, as the imported net.minecraftforge.client.ClientCommandHandler extends net.minecraft.command.CommandHandler, which contains this method.

Below is the command class, which extends CommandBase, which implements ICommand, meaning that it is the correct type for the parameter.

Spoiler

package net.minecraft.command;

import com.google.common.base.Functions;
import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;
import com.google.common.primitives.Doubles;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.UUID;
import net.minecraft.block.Block;
import net.minecraft.entity.Entity;
import net.minecraft.entity.player.EntityPlayerMP;
import net.minecraft.item.Item;
import net.minecraft.server.MinecraftServer;
import net.minecraft.util.BlockPos;
import net.minecraft.util.ChatComponentText;
import net.minecraft.util.IChatComponent;
import net.minecraft.util.ResourceLocation;

public abstract class CommandBase implements ICommand
{
    private static IAdminCommand theAdmin;

    /**
     * Return the required permission level for this command.
     */
    public int getRequiredPermissionLevel()
    {
        return 4;
    }

    public List<String> getCommandAliases()
    {
        return Collections.<String>emptyList();
    }

    /**
     * Returns true if the given command sender is allowed to use this command.
     */
    public boolean canCommandSenderUseCommand(ICommandSender sender)
    {
        return sender.canCommandSenderUseCommand(this.getRequiredPermissionLevel(), this.getCommandName());
    }

    public List<String> addTabCompletionOptions(ICommandSender sender, String[] args, BlockPos pos)
    {
        return null;
    }

    public static int parseInt(String input) throws NumberInvalidException
    {
        try
        {
            return Integer.parseInt(input);
        }
        catch (NumberFormatException var2)
        {
            throw new NumberInvalidException("commands.generic.num.invalid", new Object[] {input});
        }
    }

    public static int parseInt(String input, int min) throws NumberInvalidException
    {
        return parseInt(input, min, Integer.MAX_VALUE);
    }

    public static int parseInt(String input, int min, int max) throws NumberInvalidException
    {
        int i = parseInt(input);

        if (i < min)
        {
            throw new NumberInvalidException("commands.generic.num.tooSmall", new Object[] {Integer.valueOf(i), Integer.valueOf(min)});
        }
        else if (i > max)
        {
            throw new NumberInvalidException("commands.generic.num.tooBig", new Object[] {Integer.valueOf(i), Integer.valueOf(max)});
        }
        else
        {
            return i;
        }
    }

    public static long parseLong(String input) throws NumberInvalidException
    {
        try
        {
            return Long.parseLong(input);
        }
        catch (NumberFormatException var2)
        {
            throw new NumberInvalidException("commands.generic.num.invalid", new Object[] {input});
        }
    }

    public static long parseLong(String input, long min, long max) throws NumberInvalidException
    {
        long i = parseLong(input);

        if (i < min)
        {
            throw new NumberInvalidException("commands.generic.num.tooSmall", new Object[] {Long.valueOf(i), Long.valueOf(min)});
        }
        else if (i > max)
        {
            throw new NumberInvalidException("commands.generic.num.tooBig", new Object[] {Long.valueOf(i), Long.valueOf(max)});
        }
        else
        {
            return i;
        }
    }

    public static BlockPos parseBlockPos(ICommandSender sender, String[] args, int startIndex, boolean centerBlock) throws NumberInvalidException
    {
        BlockPos blockpos = sender.getPosition();
        return new BlockPos(parseDouble((double)blockpos.getX(), args[startIndex], -30000000, 30000000, centerBlock), parseDouble((double)blockpos.getY(), args[startIndex + 1], 0, 256, false), parseDouble((double)blockpos.getZ(), args[startIndex + 2], -30000000, 30000000, centerBlock));
    }

    public static double parseDouble(String input) throws NumberInvalidException
    {
        try
        {
            double d0 = Double.parseDouble(input);

            if (!Doubles.isFinite(d0))
            {
                throw new NumberInvalidException("commands.generic.num.invalid", new Object[] {input});
            }
            else
            {
                return d0;
            }
        }
        catch (NumberFormatException var3)
        {
            throw new NumberInvalidException("commands.generic.num.invalid", new Object[] {input});
        }
    }

    public static double parseDouble(String input, double min) throws NumberInvalidException
    {
        return parseDouble(input, min, Double.MAX_VALUE);
    }

    public static double parseDouble(String input, double min, double max) throws NumberInvalidException
    {
        double d0 = parseDouble(input);

        if (d0 < min)
        {
            throw new NumberInvalidException("commands.generic.double.tooSmall", new Object[] {Double.valueOf(d0), Double.valueOf(min)});
        }
        else if (d0 > max)
        {
            throw new NumberInvalidException("commands.generic.double.tooBig", new Object[] {Double.valueOf(d0), Double.valueOf(max)});
        }
        else
        {
            return d0;
        }
    }

    public static boolean parseBoolean(String input) throws CommandException
    {
        if (!input.equals("true") && !input.equals("1"))
        {
            if (!input.equals("false") && !input.equals("0"))
            {
                throw new CommandException("commands.generic.boolean.invalid", new Object[] {input});
            }
            else
            {
                return false;
            }
        }
        else
        {
            return true;
        }
    }

    /**
     * Returns the given ICommandSender as a EntityPlayer or throw an exception.
     */
    public static EntityPlayerMP getCommandSenderAsPlayer(ICommandSender sender) throws PlayerNotFoundException
    {
        if (sender instanceof EntityPlayerMP)
        {
            return (EntityPlayerMP)sender;
        }
        else
        {
            throw new PlayerNotFoundException("You must specify which player you wish to perform this action on.", new Object[0]);
        }
    }

    public static EntityPlayerMP getPlayer(ICommandSender sender, String username) throws PlayerNotFoundException
    {
        EntityPlayerMP entityplayermp = PlayerSelector.matchOnePlayer(sender, username);

        if (entityplayermp == null)
        {
            try
            {
                entityplayermp = MinecraftServer.getServer().getConfigurationManager().getPlayerByUUID(UUID.fromString(username));
            }
            catch (IllegalArgumentException var4)
            {
                ;
            }
        }

        if (entityplayermp == null)
        {
            entityplayermp = MinecraftServer.getServer().getConfigurationManager().getPlayerByUsername(username);
        }

        if (entityplayermp == null)
        {
            throw new PlayerNotFoundException();
        }
        else
        {
            return entityplayermp;
        }
    }

    public static Entity func_175768_b(ICommandSender p_175768_0_, String p_175768_1_) throws EntityNotFoundException
    {
        return getEntity(p_175768_0_, p_175768_1_, Entity.class);
    }

    public static <T extends Entity> T getEntity(ICommandSender commandSender, String p_175759_1_, Class <? extends T > p_175759_2_) throws EntityNotFoundException
    {
        Entity entity = PlayerSelector.matchOneEntity(commandSender, p_175759_1_, p_175759_2_);
        MinecraftServer minecraftserver = MinecraftServer.getServer();

        if (entity == null)
        {
            entity = minecraftserver.getConfigurationManager().getPlayerByUsername(p_175759_1_);
        }

        if (entity == null)
        {
            try
            {
                UUID uuid = UUID.fromString(p_175759_1_);
                entity = minecraftserver.getEntityFromUuid(uuid);

                if (entity == null)
                {
                    entity = minecraftserver.getConfigurationManager().getPlayerByUUID(uuid);
                }
            }
            catch (IllegalArgumentException var6)
            {
                throw new EntityNotFoundException("commands.generic.entity.invalidUuid", new Object[0]);
            }
        }

        if (entity != null && p_175759_2_.isAssignableFrom(entity.getClass()))
        {
            return (T)entity;
        }
        else
        {
            throw new EntityNotFoundException();
        }
    }

    public static List<Entity> func_175763_c(ICommandSender p_175763_0_, String p_175763_1_) throws EntityNotFoundException
    {
        return (List<Entity>)(PlayerSelector.hasArguments(p_175763_1_) ? PlayerSelector.matchEntities(p_175763_0_, p_175763_1_, Entity.class) : Lists.newArrayList(new Entity[] {func_175768_b(p_175763_0_, p_175763_1_)}));
    }

    public static String getPlayerName(ICommandSender sender, String query) throws PlayerNotFoundException
    {
        try
        {
            return getPlayer(sender, query).getName();
        }
        catch (PlayerNotFoundException playernotfoundexception)
        {
            if (PlayerSelector.hasArguments(query))
            {
                throw playernotfoundexception;
            }
            else
            {
                return query;
            }
        }
    }

    /**
     * Attempts to retrieve an entity's name, first assuming that the entity is a player, and then exhausting all other
     * possibilities.
     */
    public static String getEntityName(ICommandSender p_175758_0_, String p_175758_1_) throws EntityNotFoundException
    {
        try
        {
            return getPlayer(p_175758_0_, p_175758_1_).getName();
        }
        catch (PlayerNotFoundException var5)
        {
            try
            {
                return func_175768_b(p_175758_0_, p_175758_1_).getUniqueID().toString();
            }
            catch (EntityNotFoundException entitynotfoundexception)
            {
                if (PlayerSelector.hasArguments(p_175758_1_))
                {
                    throw entitynotfoundexception;
                }
                else
                {
                    return p_175758_1_;
                }
            }
        }
    }

    public static IChatComponent getChatComponentFromNthArg(ICommandSender sender, String[] args, int p_147178_2_) throws CommandException, PlayerNotFoundException
    {
        return getChatComponentFromNthArg(sender, args, p_147178_2_, false);
    }

    public static IChatComponent getChatComponentFromNthArg(ICommandSender sender, String[] args, int index, boolean p_147176_3_) throws PlayerNotFoundException
    {
        IChatComponent ichatcomponent = new ChatComponentText("");

        for (int i = index; i < args.length; ++i)
        {
            if (i > index)
            {
                ichatcomponent.appendText(" ");
            }

            IChatComponent ichatcomponent1 = net.minecraftforge.common.ForgeHooks.newChatWithLinks(args[i]); // Forge: links for messages

            if (p_147176_3_)
            {
                IChatComponent ichatcomponent2 = PlayerSelector.matchEntitiesToChatComponent(sender, args[i]);

                if (ichatcomponent2 == null)
                {
                    if (PlayerSelector.hasArguments(args[i]))
                    {
                        throw new PlayerNotFoundException();
                    }
                }
                else
                {
                    ichatcomponent1 = ichatcomponent2;
                }
            }

            ichatcomponent.appendSibling(ichatcomponent1);
        }

        return ichatcomponent;
    }

    /**
     * Builds a string starting at startPos
     */
    public static String buildString(String[] args, int startPos)
    {
        StringBuilder stringbuilder = new StringBuilder();

        for (int i = startPos; i < args.length; ++i)
        {
            if (i > startPos)
            {
                stringbuilder.append(" ");
            }

            String s = args[i];
            stringbuilder.append(s);
        }

        return stringbuilder.toString();
    }

    public static CommandBase.CoordinateArg parseCoordinate(double base, String p_175770_2_, boolean centerBlock) throws NumberInvalidException
    {
        return parseCoordinate(base, p_175770_2_, -30000000, 30000000, centerBlock);
    }

    public static CommandBase.CoordinateArg parseCoordinate(double p_175767_0_, String p_175767_2_, int min, int max, boolean centerBlock) throws NumberInvalidException
    {
        boolean flag = p_175767_2_.startsWith("~");

        if (flag && Double.isNaN(p_175767_0_))
        {
            throw new NumberInvalidException("commands.generic.num.invalid", new Object[] {Double.valueOf(p_175767_0_)});
        }
        else
        {
            double d0 = 0.0D;

            if (!flag || p_175767_2_.length() > 1)
            {
                boolean flag1 = p_175767_2_.contains(".");

                if (flag)
                {
                    p_175767_2_ = p_175767_2_.substring(1);
                }

                d0 += parseDouble(p_175767_2_);

                if (!flag1 && !flag && centerBlock)
                {
                    d0 += 0.5D;
                }
            }

            if (min != 0 || max != 0)
            {
                if (d0 < (double)min)
                {
                    throw new NumberInvalidException("commands.generic.double.tooSmall", new Object[] {Double.valueOf(d0), Integer.valueOf(min)});
                }

                if (d0 > (double)max)
                {
                    throw new NumberInvalidException("commands.generic.double.tooBig", new Object[] {Double.valueOf(d0), Integer.valueOf(max)});
                }
            }

            return new CommandBase.CoordinateArg(d0 + (flag ? p_175767_0_ : 0.0D), d0, flag);
        }
    }

    public static double parseDouble(double base, String input, boolean centerBlock) throws NumberInvalidException
    {
        return parseDouble(base, input, -30000000, 30000000, centerBlock);
    }

    public static double parseDouble(double base, String input, int min, int max, boolean centerBlock) throws NumberInvalidException
    {
        boolean flag = input.startsWith("~");

        if (flag && Double.isNaN(base))
        {
            throw new NumberInvalidException("commands.generic.num.invalid", new Object[] {Double.valueOf(base)});
        }
        else
        {
            double d0 = flag ? base : 0.0D;

            if (!flag || input.length() > 1)
            {
                boolean flag1 = input.contains(".");

                if (flag)
                {
                    input = input.substring(1);
                }

                d0 += parseDouble(input);

                if (!flag1 && !flag && centerBlock)
                {
                    d0 += 0.5D;
                }
            }

            if (min != 0 || max != 0)
            {
                if (d0 < (double)min)
                {
                    throw new NumberInvalidException("commands.generic.double.tooSmall", new Object[] {Double.valueOf(d0), Integer.valueOf(min)});
                }

                if (d0 > (double)max)
                {
                    throw new NumberInvalidException("commands.generic.double.tooBig", new Object[] {Double.valueOf(d0), Integer.valueOf(max)});
                }
            }

            return d0;
        }
    }

    /**
     * Gets the Item specified by the given text string.  First checks the item registry, then tries by parsing the
     * string as an integer ID (deprecated).  Warns the sender if we matched by parsing the ID.  Throws if the item
     * wasn't found.  Returns the item if it was found.
     */
    public static Item getItemByText(ICommandSender sender, String id) throws NumberInvalidException
    {
        ResourceLocation resourcelocation = new ResourceLocation(id);
        Item item = (Item)Item.itemRegistry.getObject(resourcelocation);

        if (item == null)
        {
            throw new NumberInvalidException("commands.give.item.notFound", new Object[] {resourcelocation});
        }
        else
        {
            return item;
        }
    }

    /**
     * Gets the Block specified by the given text string.  First checks the block registry, then tries by parsing the
     * string as an integer ID (deprecated).  Warns the sender if we matched by parsing the ID.  Throws if the block
     * wasn't found.  Returns the block if it was found.
     */
    public static Block getBlockByText(ICommandSender sender, String id) throws NumberInvalidException
    {
        ResourceLocation resourcelocation = new ResourceLocation(id);

        if (!Block.blockRegistry.containsKey(resourcelocation))
        {
            throw new NumberInvalidException("commands.give.block.notFound", new Object[] {resourcelocation});
        }
        else
        {
            Block block = (Block)Block.blockRegistry.getObject(resourcelocation);

            if (block == null)
            {
                throw new NumberInvalidException("commands.give.block.notFound", new Object[] {resourcelocation});
            }
            else
            {
                return block;
            }
        }
    }

    /**
     * Creates a linguistic series joining the input objects together.  Examples: 1) {} --> "",  2) {"Steve"} -->
     * "Steve",  3) {"Steve", "Phil"} --> "Steve and Phil",  4) {"Steve", "Phil", "Mark"} --> "Steve, Phil and Mark"
     */
    public static String joinNiceString(Object[] elements)
    {
        StringBuilder stringbuilder = new StringBuilder();

        for (int i = 0; i < elements.length; ++i)
        {
            String s = elements[i].toString();

            if (i > 0)
            {
                if (i == elements.length - 1)
                {
                    stringbuilder.append(" and ");
                }
                else
                {
                    stringbuilder.append(", ");
                }
            }

            stringbuilder.append(s);
        }

        return stringbuilder.toString();
    }

    public static IChatComponent join(List<IChatComponent> components)
    {
        IChatComponent ichatcomponent = new ChatComponentText("");

        for (int i = 0; i < components.size(); ++i)
        {
            if (i > 0)
            {
                if (i == components.size() - 1)
                {
                    ichatcomponent.appendText(" and ");
                }
                else if (i > 0)
                {
                    ichatcomponent.appendText(", ");
                }
            }

            ichatcomponent.appendSibling((IChatComponent)components.get(i));
        }

        return ichatcomponent;
    }

    /**
     * Creates a linguistic series joining together the elements of the given collection.  Examples: 1) {} --> "",  2)
     * {"Steve"} --> "Steve",  3) {"Steve", "Phil"} --> "Steve and Phil",  4) {"Steve", "Phil", "Mark"} --> "Steve, Phil
     * and Mark"
     */
    public static String joinNiceStringFromCollection(Collection<String> strings)
    {
        /**
         * Creates a linguistic series joining the input objects together.  Examples: 1) {} --> "",  2) {"Steve"} -->
         * "Steve",  3) {"Steve", "Phil"} --> "Steve and Phil",  4) {"Steve", "Phil", "Mark"} --> "Steve, Phil and Mark"
         */
        return joinNiceString(strings.toArray(new String[strings.size()]));
    }

    public static List<String> func_175771_a(String[] p_175771_0_, int p_175771_1_, BlockPos p_175771_2_)
    {
        if (p_175771_2_ == null)
        {
            return null;
        }
        else
        {
            int i = p_175771_0_.length - 1;
            String s;

            if (i == p_175771_1_)
            {
                s = Integer.toString(p_175771_2_.getX());
            }
            else if (i == p_175771_1_ + 1)
            {
                s = Integer.toString(p_175771_2_.getY());
            }
            else
            {
                if (i != p_175771_1_ + 2)
                {
                    return null;
                }

                s = Integer.toString(p_175771_2_.getZ());
            }

            return Lists.newArrayList(new String[] {s});
        }
    }

    public static List<String> func_181043_b(String[] p_181043_0_, int p_181043_1_, BlockPos p_181043_2_)
    {
        if (p_181043_2_ == null)
        {
            return null;
        }
        else
        {
            int i = p_181043_0_.length - 1;
            String s;

            if (i == p_181043_1_)
            {
                s = Integer.toString(p_181043_2_.getX());
            }
            else
            {
                if (i != p_181043_1_ + 1)
                {
                    return null;
                }

                s = Integer.toString(p_181043_2_.getZ());
            }

            return Lists.newArrayList(new String[] {s});
        }
    }

    /**
     * Returns true if the given substring is exactly equal to the start of the given string (case insensitive).
     */
    public static boolean doesStringStartWith(String original, String region)
    {
        return region.regionMatches(true, 0, original, 0, original.length());
    }

    public static List<String> getListOfStringsMatchingLastWord(String[] args, String... possibilities)
    {
        return getListOfStringsMatchingLastWord(args, Arrays.asList(possibilities));
    }

    public static List<String> getListOfStringsMatchingLastWord(String[] p_175762_0_, Collection<?> p_175762_1_)
    {
        String s = p_175762_0_[p_175762_0_.length - 1];
        List<String> list = Lists.<String>newArrayList();

        if (!p_175762_1_.isEmpty())
        {
            for (String s1 : Iterables.transform(p_175762_1_, Functions.toStringFunction()))
            {
                if (doesStringStartWith(s, s1))
                {
                    list.add(s1);
                }
            }

            if (list.isEmpty())
            {
                for (Object object : p_175762_1_)
                {
                    if (object instanceof ResourceLocation && doesStringStartWith(s, ((ResourceLocation)object).getResourcePath()))
                    {
                        list.add(String.valueOf(object));
                    }
                }
            }
        }

        return list;
    }

    /**
     * Return whether the specified command parameter index is a username parameter.
     *  
     * @param args The arguments that were passed
     */
    public boolean isUsernameIndex(String[] args, int index)
    {
        return false;
    }

    public static void notifyOperators(ICommandSender sender, ICommand command, String msgFormat, Object... msgParams)
    {
        notifyOperators(sender, command, 0, msgFormat, msgParams);
    }

    public static void notifyOperators(ICommandSender sender, ICommand command, int p_152374_2_, String msgFormat, Object... msgParams)
    {
        if (theAdmin != null)
        {
            theAdmin.notifyOperators(sender, command, p_152374_2_, msgFormat, msgParams);
        }
    }

    /**
     * Sets the static IAdminCommander.
     */
    public static void setAdminCommander(IAdminCommand command)
    {
        theAdmin = command;
    }

    public int compareTo(ICommand p_compareTo_1_)
    {
        return this.getCommandName().compareTo(p_compareTo_1_.getCommandName());
    }

    public static class CoordinateArg
        {
            private final double field_179633_a;
            private final double field_179631_b;
            private final boolean field_179632_c;

            protected CoordinateArg(double p_i46051_1_, double p_i46051_3_, boolean p_i46051_5_)
            {
                this.field_179633_a = p_i46051_1_;
                this.field_179631_b = p_i46051_3_;
                this.field_179632_c = p_i46051_5_;
            }

            public double func_179628_a()
            {
                return this.field_179633_a;
            }

            public double func_179629_b()
            {
                return this.field_179631_b;
            }

            public boolean func_179630_c()
            {
                return this.field_179632_c;
            }
        }
}

 

Sorry if this is a dumb mistake, I'm new to Forge and Gradle.

 

One last thing, the version of forge I'm using to write this in and the version that the client is in are the exact same, so it's not a version mismatch.

[Animefan8888]

4 minutes ago, Jakeob said:

The game crashed whilst there was a severe problem during mod loading that has caused the game to fail
Error: net.minecraftforge.fml.common.LoaderException: java.lang.NoSuchMethodError: net.minecraft.command.CommandHandler.registerCommand(Lnet/minecraft/command/ICommand;)Lnet/minecraft/command/ICommand;

It would be easier if you posted the whole error, but I believe this is an issue with sidedness.

[Jakeob]

22 minutes ago, Animefan8888 said:

It would be easier if you posted the whole error, but I believe this is an issue with sidedness.

Thanks for the response. I've read that tutorial before, do you have any idea as to where I'm referencing something server-sided? Thanks again for the help. Below is the full stacktrace from the log:

Spoiler

There was a severe problem during mod loading that has caused the game to fail

net.minecraftforge.fml.common.LoaderException: java.lang.NoSuchMethodError: net.minecraftforge.client.ClientCommandHandler.registerCommand(Lnet/minecraft/command/ICommand;)Lnet/minecraft/command/ICommand;
    at net.minecraftforge.fml.common.LoadController.transition(LoadController.java:162)
    at net.minecraftforge.fml.common.Loader.initializeMods(Loader.java:739)
    at net.minecraftforge.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:310)
    at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:495)
    at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:329)
    at net.minecraft.client.main.Main.main(SourceFile:124)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
    at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
Caused by: java.lang.NoSuchMethodError: net.minecraftforge.client.ClientCommandHandler.registerCommand(Lnet/minecraft/command/ICommand;)Lnet/minecraft/command/ICommand;
    at ga.jakeobrien.bedwarsboisstatistics.BedwarsBoisStatistics.init(BedwarsBoisStatistics.java:18)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at net.minecraftforge.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:560)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74)
    at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47)
    at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322)
    at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304)
    at com.google.common.eventbus.EventBus.post(EventBus.java:275)
    at net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:211)
    at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:189)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74)
    at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47)
    at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322)
    at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304)
    at com.google.common.eventbus.EventBus.post(EventBus.java:275)
    at net.minecraftforge.fml.common.LoadController.distributeStateMessage(LoadController.java:118)
    at net.minecraftforge.fml.common.Loader.initializeMods(Loader.java:737)
    ... 10 more

 

[DaemonUmbra]

3 minutes ago, Jakeob said:

Caused by: java.lang.NoSuchMethodError: net.minecraftforge.client.ClientCommandHandler.registerCommand(Lnet/minecraft/command/ICommand;)Lnet/minecraft/command/ICommand;
    at ga.jakeobrien.bedwarsboisstatistics.BedwarsBoisStatistics.init(BedwarsBoisStatistics.java:18)

Problematic Code #15

Edited July 20, 2018 by DaemonUmbra

[Jakeob]

46 minutes ago, DaemonUmbra said:

Problematic Code #15

Thanks for the response. I went and created ClientProxy, ServerProxy, and CommonProxy classes, and put my command registration in the ClientProxy, but I'm still getting the same error

The main class:

Spoiler

@Mod(modid = BedwarsBoisStatistics.MODID, useMetadata = true, clientSideOnly = true)
public class BedwarsBoisStatistics
{
    public static final String MODID = "bedwarsboisstatistics";
    //public static final String VERSION = "1.8.9-0.0.0.4";

    @SidedProxy(clientSide = "ga.jakeobrien.bedwarsboisstatistics.proxy.ClientProxy", serverSide = "ga.jakeobrien.proxy.ServerProxy")
    public static CommonProxy proxy;

    @EventHandler
    public void preInit( FMLPreInitializationEvent e ){
        proxy.preInit(e);
    }

    @EventHandler
    public void init( FMLInitializationEvent e ){
        proxy.init(e);
    }

    @EventHandler
    public void postInit( FMLPostInitializationEvent e ){
        proxy.postInit(e);
    }
}

 

The ClientProxy class:

Spoiler

public class ClientProxy extends CommonProxy {

    public void preInit(FMLPreInitializationEvent e ){
        super.preInit(e);
    }

    public void init(FMLInitializationEvent e ){
        super.init(e);
        ClientCommandHandler.instance.registerCommand(new TestSidebarScoresCommand());
    }

    public void postInit(FMLPostInitializationEvent e ){
        super.postInit(e);

    }
}

 

The CommonProxy class:

Spoiler

public class CommonProxy {

    public void preInit(FMLPreInitializationEvent e ){



    }

    public void init(FMLInitializationEvent e ){



    }

    public void postInit(FMLPostInitializationEvent e ){



    }

}

 

Anything I'm doing wrong? Thanks again for the help so far.

Edited July 20, 2018 by Jakeob

[DaemonUmbra]

Code Style #1 and #2

In addition: Are you sure you have your server proxy in the right place AND have your serverSide set correctly in the @SidedProxy annotation?

[Jakeob]

Thanks for the code style tips, I was a little confused on the point of the common proxy over just the main class when looking at example code. I fixed the wrong serverSide path in the @SidedProxy (How did I miss that...), but it's still giving the same error. Thanks for all the help.

[DaemonUmbra]

You're sure it's the same error?

[Jakeob]

2 minutes ago, DaemonUmbra said:

You're sure it's the same error?

Yup. Just recompiled and ran just to be sure, attached below:

Spoiler

There was a severe problem during mod loading that has caused the game to fail

net.minecraftforge.fml.common.LoaderException: java.lang.NoSuchMethodError: net.minecraftforge.client.ClientCommandHandler.registerCommand(Lnet/minecraft/command/ICommand;)Lnet/minecraft/command/ICommand;
    at net.minecraftforge.fml.common.LoadController.transition(LoadController.java:162)
    at net.minecraftforge.fml.common.Loader.initializeMods(Loader.java:739)
    at net.minecraftforge.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:310)
    at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:495)
    at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:329)
    at net.minecraft.client.main.Main.main(SourceFile:124)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
    at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
Caused by: java.lang.NoSuchMethodError: net.minecraftforge.client.ClientCommandHandler.registerCommand(Lnet/minecraft/command/ICommand;)Lnet/minecraft/command/ICommand;
    at ga.jakeobrien.bedwarsboisstatistics.proxy.ClientProxy.init(ClientProxy.java:20)
    at ga.jakeobrien.bedwarsboisstatistics.BedwarsBoisStatistics.init(BedwarsBoisStatistics.java:27)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at net.minecraftforge.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:560)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74)
    at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47)
    at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322)
    at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304)
    at com.google.common.eventbus.EventBus.post(EventBus.java:275)
    at net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:211)
    at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:189)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74)
    at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47)
    at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322)
    at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304)
    at com.google.common.eventbus.EventBus.post(EventBus.java:275)
    at net.minecraftforge.fml.common.LoadController.distributeStateMessage(LoadController.java:118)
    at net.minecraftforge.fml.common.Loader.initializeMods(Loader.java:737)
    ... 10 more

ClientProxy.java:20 is 

ClientCommandHandler.instance.registerCommand(new TestSidebarScoresCommand());

 

[DaemonUmbra]

Would you mind posting your source code on GitHub? It's easier than showing individual files.

[Animefan8888]

6 minutes ago, Jakeob said:

Yup. Just recompiled and ran just to be sure, attached below:

How are you compiling your code? Just in case read this general issues #1.

Edited July 20, 2018 by Animefan8888

[Jakeob]

Running the build jar script (highlighted) and copying the jar to my mods directory

[DaemonUmbra]

You should be using the build task.

In your image: Tasks > build > build

[Jakeob]

ugh... now I'm just facepalming, I probably should've realized it was a build error when runClient worked but the jar didn't. Thanks a ton for all the help guys, sorry for my stupidity.