larsgerrits

The first thing to note is that the Minecraft class is @SIdeOnly(Side.CLIENT). This means, you can access the class with a client or a remote server, but not on a dedicated server. Trying to load it in a dedicated server will cause Minecraft to crash with a ClassNotFoundException. So be careful to use this for client-side things only, like rendering. 1) 2 separate instance will have 2 seperate Minecraft classes, and they don't know about each other. So the first instance won't return the Minecraft as the other instance. 2) The Minecraft#player variable is initialized when the world is loaded. I don't think there's an event for that. 3) The Minecraft#world variable is initialized in the same method as the player, so they'll be accessible at the same time. Again, there's no event to catch that.

Post the FML logs (logs/fml-client-latest.log). You might have a mod version incompatible with the Minecraft version.

Why?

You're running Minecraft + Forge for 1.11.2 with Optifine for 1.7.10.

It's an issue with AM2, report it to the author. And the next time, please post the complete FML log.

Post the FML log (logs/fml-client-latest.log). Also, check if all the mods are for the right version and the latest version.

Read the EAQ and follow the instructions.

logs/fml-client-latest.log in your profile folder.

Which means it's called on the client-side. On the client-side, you can use the Minecraft class which contains a lot of information about the game, including the player and the world he's in.

net.minecraftforge.fml.common.LoaderExceptionModCrash: Caught exception from Architects, Builders and Designers Mod (abad) Caused by: java.lang.NullPointerException at com.scorpiocruz.abad.init.ModItems.registerRender(ModItems.java:46) The error is caused by the Architects, Builders and Designers mod. Report it to the author.

After a bit of Googling, I think it means "always run without a prompt asking you if it's safe to run a JAR file", rather than "this program is running 24/7". Assuming you downloaded Forge from the official file server, it should be safe.

logs/fml-client-latest.log

You're using 1.7.10. 1.7.10 is no longer supported on this forum. Update if you want support.

You'll have to wait until the site's back up.

If you're just reading books and not writing any code, you're not learning. You are remembering. Have you written anything in Java besides Minecraft? You really should.