Forge Crashes Minecraft

I'm trying to play Minecraft 1.20.4 on Forge using mods, but when Minecraft loads, it says there are non-Forge mods, whereas they are Forge mods. This problem is happening in Forge version 1.20.4 - 49.0.46. I am only able to play with all mods in Forge version 1.20.4 - 49.0.43.

I had the same issue. The only thing I could do is to remove parchment mappings entirely from config files and replace config files from the MDK: 1. replace build.gradle from MDK 2. restore official mapping in build.properties 3. replace src\main\resources\META-INF\mods.toml from MDK sample.

---- Minecraft Crash Report ---- I sent a error report i just cant understand it, the game as been running fine intill today i loaded it https://pastebin.com/gWVFh4Fe   WARNING: coremods are present:   ForgelinPlugin (Forgelin-1.8.3.jar)   PatchingFixRtmCorePlugin (fixRtm-2.0.28.jar)   IELoadingPlugin (ImmersiveEngineering-core-0.12-98.jar)   FixRtmCorePlugin (fixRtm-2.0.28.jar)   JarInJarLoaderCoreMod (fixRtm-2.0.28.jar)   BetterFoliageLoader (BetterFoliage-MC1.12-2.3.2.jar)   SecurityCraftLoadingPlugin ([1.12.2] SecurityCraft v1.9.9.jar)   OpenModsCorePlugin (OpenModsLib-1.12.2-0.12.2.jar)   MalisisCorePlugin (MalisisCore-1.12.2.jar)   ObfuscatePlugin (obfuscate-0.4.2-1.12.2.jar)   CTMCorePlugin (CTM-MC1.12.2-1.0.2.31.jar)   HookingFixRtmCorePlugin (fixRtm-2.0.28.jar) Contact their authors BEFORE contacting forge // Hey, that tickles! Hehehe! Time: 4/19/24 4:05 PM Description: Updating screen events java.lang.RuntimeException: Failed to check session lock, aborting     at net.minecraft.world.storage.SaveHandler.func_75766_h(SaveHandler.java:76)     at net.minecraft.world.storage.SaveHandler.<init>(SaveHandler.java:54)     at net.minecraft.world.chunk.storage.AnvilSaveHandler.<init>(AnvilSaveHandler.java:18)     at net.minecraft.world.chunk.storage.AnvilSaveConverter.func_75804_a(SourceFile:84)     at net.minecraft.client.Minecraft.func_71371_a(Minecraft.java:2346)     at net.minecraftforge.fml.client.FMLClientHandler.tryLoadExistingWorld(FMLClientHandler.java:734)     at net.minecraft.client.gui.GuiListWorldSelectionEntry.func_186777_e(GuiListWorldSelectionEntry.java:249)     at net.minecraft.client.gui.GuiListWorldSelectionEntry.func_186774_a(GuiListWorldSelectionEntry.java:199)     at net.minecraft.client.gui.GuiListWorldSelectionEntry.func_148278_a(GuiListWorldSelectionEntry.java:163)     at net.minecraft.client.gui.GuiListExtended.func_148179_a(SourceFile:41)     at net.minecraft.client.gui.GuiWorldSelection.func_73864_a(SourceFile:117)     at net.minecraft.client.gui.GuiScreen.func_146274_d(GuiScreen.java:533)     at net.minecraft.client.gui.GuiWorldSelection.func_146274_d(SourceFile:49)     at net.minecraft.client.gui.GuiScreen.func_146269_k(GuiScreen.java:501)     at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1759)     at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1098)     at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:398)     at net.minecraft.client.main.Main.main(SourceFile:123)     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) A detailed walkthrough of the error, its code path and all known details is as follows: --------------------------------------------------------------------------------------- -- Head -- Thread: Client thread Stacktrace:     at net.minecraft.world.storage.SaveHandler.func_75766_h(SaveHandler.java:76)     at net.minecraft.world.storage.SaveHandler.<init>(SaveHandler.java:54)     at net.minecraft.world.chunk.storage.AnvilSaveHandler.<init>(AnvilSaveHandler.java:18)     at net.minecraft.world.chunk.storage.AnvilSaveConverter.func_75804_a(SourceFile:84)     at net.minecraft.client.Minecraft.func_71371_a(Minecraft.java:2346)     at net.minecraftforge.fml.client.FMLClientHandler.tryLoadExistingWorld(FMLClientHandler.java:734)     at net.minecraft.client.gui.GuiListWorldSelectionEntry.func_186777_e(GuiListWorldSelectionEntry.java:249)     at net.minecraft.client.gui.GuiListWorldSelectionEntry.func_186774_a(GuiListWorldSelectionEntry.java:199)     at net.minecraft.client.gui.GuiListWorldSelectionEntry.func_148278_a(GuiListWorldSelectionEntry.java:163)     at net.minecraft.client.gui.GuiListExtended.func_148179_a(SourceFile:41)     at net.minecraft.client.gui.GuiWorldSelection.func_73864_a(SourceFile:117)     at net.minecraft.client.gui.GuiScreen.func_146274_d(GuiScreen.java:533)     at net.minecraft.client.gui.GuiWorldSelection.func_146274_d(SourceFile:49)     at net.minecraft.client.gui.GuiScreen.func_146269_k(GuiScreen.java:501) -- Affected screen -- Details:     Screen name: net.minecraft.client.gui.GuiWorldSelection Stacktrace:     at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1759)     at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1098)     at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:398)     at net.minecraft.client.main.Main.main(SourceFile:123)     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) -- System Details -- Details:     Minecraft Version: 1.12.2     Operating System: Windows 10 (amd64) version 10.0     Java Version: 1.8.0_51, Oracle Corporation     Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation     Memory: 5013709368 bytes (4781 MB) / 11274289152 bytes (10752 MB) up to 12884901888 bytes (12288 MB)     JVM Flags: 8 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx12G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M     IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0     FML: MCP 9.42 Powered by Forge 14.23.5.2859 Optifine OptiFine_1.12.2_HD_U_G5 99 mods loaded, 99 mods active     States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored     | State  | ID                          | Version               | Source                                            | Signature                                |     |:------ |:--------------------------- |:--------------------- |:------------------------------------------------- |:---------------------------------------- |     | LCHIJA | minecraft                   | 1.12.2                | minecraft.jar                                     | None                                     |     | LCHIJA | mcp                         | 9.42                  | minecraft.jar                                     | None                                     |     | LCHIJA | FML                         | 8.0.99.99             | forge-1.12.2-14.23.5.2859.jar                     | e3c3d50c7c986df74c645c0ac54639741c90a557 |     | LCHIJA | forge                       | 14.23.5.2859          | forge-1.12.2-14.23.5.2859.jar                     | e3c3d50c7c986df74c645c0ac54639741c90a557 |     | LCHIJA | openmodscore                | 0.12.2                | minecraft.jar                                     | None                                     |     | LCHIJA | obfuscate                   | 0.4.2                 | minecraft.jar                                     | None                                     |     | LCHIJA | securitycraft               | v1.9.9                | [1.12.2] SecurityCraft v1.9.9.jar                 | None                                     |     | LCHIJA | mts                         | 22.14.2               | Immersive Vehicles-1.12.2-22.14.2.jar             | None                                     |     | LCHIJA | mtsaircooled                | 1.0.1                 | Air-Cooled Pack [MTS] 1.10.2-14.0.0-1.0.1.jar     | None                                     |     | LCHIJA | codechickenlib              | 3.2.3.358             | CodeChickenLib-1.12.2-3.2.3.358-universal.jar     | f1850c39b2516232a2108a7bd84d1cb5df93b261 |     | LCHIJA | ancientwarfare              | 1.12.2-2.7.0.1038     | ancientwarfare-1.12.2-2.7.0.1038.jar              | None                                     |     | LCHIJA | redstoneflux                | 2.1.1                 | RedstoneFlux-1.12-2.1.1.1-universal.jar           | None                                     |     | LCHIJA | ancientwarfareautomation    | 1.12.2-2.7.0.1038     | ancientwarfare-1.12.2-2.7.0.1038.jar              | None                                     |     | LCHIJA | ancientwarfarenpc           | 1.12.2-2.7.0.1038     | ancientwarfare-1.12.2-2.7.0.1038.jar              | None                                     |     | LCHIJA | ancientwarfarestructure     | 1.12.2-2.7.0.1038     | ancientwarfare-1.12.2-2.7.0.1038.jar              | None                                     |     | LCHIJA | ancientwarfarevehicle       | 1.12.2-2.7.0.1038     | ancientwarfare-1.12.2-2.7.0.1038.jar              | None                                     |     | LCHIJA | craftstudioapi              | 1.0.0                 | CraftStudio-1.0.0.93-mc1.12-alpha.jar             | None                                     |     | LCHIJA | animania                    | 2.0.3.28              | animania-1.12.2-base-2.0.3.28.jar                 | None                                     |     | LCHIJA | architecturecraft           | @VERSION@             | architecturecraft-1.12-3.108.jar                  | None                                     |     | LCHIJA | betteranimationscollection2 | 1.0.2                 | BetterAnimationsCollection2-v1.0.2-1.12.2.jar     | 12d137bcc36051a1c2c8ea7211cfc1da1c6e9dea |     | LCHIJA | forgelin                    | 1.8.3                 | Forgelin-1.8.3.jar                                | None                                     |     | LCHIJA | betterfoliage               | 2.3.1                 | BetterFoliage-MC1.12-2.3.2.jar                    | None                                     |     | LCHIJA | bibliocraft                 | 2.4.6                 | BiblioCraft[v2.4.6][MC1.12.2].jar                 | None                                     |     | LCHIJA | biomestaff                  | 1.0.0                 | BiomeStaff-1.12.2-1.0.0.jar                       | None                                     |     | LCHIJA | blockcraftery               | 1.12.2-1.3.1          | blockcraftery-1.12.2-1.3.1.jar                    | None                                     |     | LCHIJA | bookshelf                   | 2.3.590               | Bookshelf-1.12.2-2.3.590.jar                      | d476d1b22b218a10d845928d1665d45fce301b27 |     | LCHIJA | bookworm                    | 1.12.2-2.5.2.1        | Bookworm-Library-Mod-1.12.2.jar                   | None                                     |     | LCHIJA | brandonscore                | 2.4.20                | BrandonsCore-1.12.2-2.4.20.162-universal.jar      | None                                     |     | LCHIJA | bspkrscore                  | 8.0.0                 | BspkrsCore-1.12.2.jar                             | None                                     |     | LCHIJA | carpentersblocks            | 3.4.0-poc.6           | Carpenters-Blocks-v3.4.0-poc.6-MC-1.12.2.jar      | None                                     |     | LCHIJA | ctm                         | MC1.12.2-1.0.2.31     | CTM-MC1.12.2-1.0.2.31.jar                         | None                                     |     | LCHIJA | jei                         | 4.16.1.1012           | jei_1.12.2-4.16.1.1012.jar                        | None                                     |     | LCHIJA | chisel                      | MC1.12.2-1.0.2.45     | Chisel-Mod-1.12.2.jar                             | None                                     |     | LCHIJA | chiselsandbits              | 14.33                 | chiselsandbits-14.33.jar                          | None                                     |     | LCHIJA | customspawner               | 3.11.4                | CustomMobSpawner-3.11.5.jar                       | None                                     |     | LCHIJA | customsignposts             | 1.0                   | customsignposts-1.12.2-1.0.1.jar                  | None                                     |     | LCHIJA | ptrmodellib                 | 1.0.5                 | PTRLib-1.0.5.jar                                  | None                                     |     | LCHIJA | props                       | 2.6.3.7               | Decocraft-2.6.3.7_1.12.2.jar                      | None                                     |     | LCHIJA | mocreatures                 | 12.0.5                | DrZharks MoCreatures Mod-12.0.5.jar               | None                                     |     | LCHIJA | engineersdecor              | 1.1.5                 | engineersdecor-1.12.2-1.1.5.jar                   | ed58ed655893ced6280650866985abcae2bf7559 |     | LCHIJA | exoticbirds                 | 1.0                   | Exotic Birds 1.12.2-3.2.0.jar                     | None                                     |     | LCHIJA | unuparts                    | 6.5.0                 | UNU Parts Pack [MTS] 1.12.2-22.13.0-6.5.0.jar     | None                                     |     | LCHIJA | unuverse                    | 2.0.0                 | ExpandedUNUversePack[MTS]1.12.2-19.15.5-2.0.0.jar | None                                     |     | LCHIJA | fairylights                 | 2.1.10                | fairylights-2.2.0-1.12.2.jar                      | None                                     |     | LCHIJA | fcl                         | 1.12.82               | FCL-1.12.82c.jar                                  | None                                     |     | LCHIJA | net/fexcraft/lib/frl        | 1.2                   | FCL-1.12.82c.jar                                  | None                                     |     | LCHIJA | net/fexcraft/lib/tmt        | 1.15                  | FCL-1.12.82c.jar                                  | None                                     |     | LCHIJA | famm                        | 3.4.0                 | Fexs-Alphabet-and-More-Mod-Forge-1.12.2.jar       | None                                     |     | LCHIJA | forgemultipartcbe           | 2.6.2.83              | ForgeMultipart-1.12.2-2.6.2.83-universal.jar      | f1850c39b2516232a2108a7bd84d1cb5df93b261 |     | LCHIJA | microblockcbe               | 2.6.2.83              | ForgeMultipart-1.12.2-2.6.2.83-universal.jar      | None                                     |     | LCHIJA | minecraftmultipartcbe       | 2.6.2.83              | ForgeMultipart-1.12.2-2.6.2.83-universal.jar      | None                                     |     | LCHIJA | funkylocomotion             | 1.0                   | funky-locomotion-1.12.2-1.1.2.jar                 | None                                     |     | LCHIJA | furenikusroads              | 1.2.5                 | Furenikus_Roads-1.2.5.jar                         | None                                     |     | LCHIJA | cfm                         | 6.3.0                 | furniture-6.3.2-1.12.2.jar                        | None                                     |     | LCHIJA | waila                       | 1.8.22                | Hwyla-1.8.22-B37_1.12.jar                         | None                                     |     | LCHIJA | trackapi                    | 1.2                   | TrackAPI-1.2.jar                                  | None                                     |     | LCHIJA | universalmodcore            | 1.2.1                 | UniversalModCore-1.12.2-forge-1.2.1.jar           | None                                     |     | LCHIJA | immersiverailroading        | 1.10.0                | ImmersiveRailroading-1.12.2-forge-1.10.0.jar      | None                                     |     | LCHIJA | journeymap                  | 1.12.2-5.7.1p2        | journeymap-1.12.2-5.7.1p2.jar                     | None                                     |     | LCHIJA | zawa                        | 1.12.2-2.1.3          | zawa-1.12.2-2.1.3.jar                             | 3ee471ded1bba54aa82f4f5ca5ca82dd67b8ef42 |     | LCHIJA | lilcritters                 | 1.12.2-1.1.0.0        | Lil-Critters-Mod-Forge-1.12.2.jar                 | None                                     |     | LCHIJA | malisiscore                 | 1.12.2-6.5.1-SNAPSHOT | MalisisCore-1.12.2.jar                            | None                                     |     | LCHIJA | malisisdoors                | 1.12.2-7.3.0          | MalisisDoors-Mod-1.12.2.jar                       | None                                     |     | LCHIJA | mcwbridges                  | 1.0.6                 | mcw-bridges-1.0.6b-mc1.12.2.jar                   | None                                     |     | LCHIJA | mcwfences                   | 1.0.0                 | mcw-fences-1.0.0-mc1.12.2.jar                     | None                                     |     | LCHIJA | mcwroofs                    | 1.0.2                 | mcw-roofs-1.0.2-mc1.12.2.jar                      | None                                     |     | LCHIJA | moon-core                   | 7.0                   | Moons-Core-Forge-1.12.2.jar                       | None                                     |     | LCHIJA | mrtjpcore                   | 2.1.4.43              | MrTJPCore-1.12.2-2.1.4.43-universal.jar           | None                                     |     | LCHIJA | railcraft                   | 12.0.0                | railcraft-12.0.0.jar                              | a0c255ac501b2749537d5824bb0f0588bf0320fa |     | LCHIJA | mtr                         | 3.0.0                 | MTR-1.12.2-alpha-test-0.0.1.jar                   | None                                     |     | LCHIJA | kadwinjpvehicles            | 2.0.0                 | MTS_Kadwin_JP_Vehicles_Pack_4.1.jar               | None                                     |     | LCHIJA | ngtlib                      | 2.4.21                | NGTLib2.4.21-38_forge-1.12.2-14.23.2.2611.jar     | None                                     |     | LCHIJA | projectintelligence         | 1.0.9                 | ProjectIntelligence-1.12.2-1.0.9.28-universal.jar | None                                     |     | LCHIJA | nei                         | 2.4.3                 | NotEnoughItems-1.12.2-2.4.3.245-universal.jar     | f1850c39b2516232a2108a7bd84d1cb5df93b261 |     | LCHIJA | oe                          | 1.0.7                 | OceanicExpanse-1.0.7.jar                          | None                                     |     | LCHIJA | openmods                    | 0.12.2                | OpenModsLib-1.12.2-0.12.2.jar                     | d2a9a8e8440196e26a268d1f3ddc01b2e9c572a5 |     | LCHIJA | openblocks                  | 1.8.1                 | OpenBlocks-1.12.2-1.8.1.jar                       | d2a9a8e8440196e26a268d1f3ddc01b2e9c572a5 |     | LCHIJA | placeableitems              | 3.3                   | placeableitems-3.3.jar                            | None                                     |     | LCHIJA | projectred-core             | 4.9.4.120             | ProjectRed-1.12.2-4.9.4.120-Base.jar              | None                                     |     | LCHIJA | projectred-integration      | 4.9.4.120             | ProjectRed-1.12.2-4.9.4.120-integration.jar       | None                                     |     | LCHIJA | projectred-transmission     | 4.9.4.120             | ProjectRed-1.12.2-4.9.4.120-integration.jar       | None                                     |     | LCHIJA | projectred-illumination     | 4.9.4.120             | ProjectRed-1.12.2-4.9.4.120-lighting.jar          | None                                     |     | LCHIJA | projectred-expansion        | 4.9.4.120             | ProjectRed-1.12.2-4.9.4.120-mechanical.jar        | None                                     |     | LCHIJA | projectred-relocation       | 4.9.4.120             | ProjectRed-1.12.2-4.9.4.120-mechanical.jar        | None                                     |     | LCHIJA | projectred-transportation   | 4.9.4.120             | ProjectRed-1.12.2-4.9.4.120-mechanical.jar        | None                                     |     | LCHIJA | rtm                         | 2.4.24                | RTM2.4.24-43_forge-1.12.2-14.23.2.2611.jar        | None                                     |     | LCHIJA | trafficcontrol              | 1.1.1                 | trafficcontrol-1.1.1.jar                          | None                                     |     | LCHIJA | travelersbackpack           | 1.0.35                | TravelersBackpack-1.12.2-1.0.35.jar               | None                                     |     | LCHIJA | iv_tpp                      | 2.22.0                | Trin Parts Pack-1.12.2-2.23.1.jar                 | None                                     |     | LCHIJA | unucivil                    | 6.3.0                 | UNU Civilian Pack [MTS] 1.12.2-22.13.0-6.3.0.jar  | None                                     |     | LCHIJA | vehicle                     | 0.44.1                | vehicle-mod-0.44.1-1.12.2.jar                     | None                                     |     | LCHIJA | wawla                       | 2.6.275               | Wawla-1.12.2-2.6.275.jar                          | d476d1b22b218a10d845928d1665d45fce301b27 |     | LCHIJA | worldedit                   | 6.1.10                | worldedit-forge-mc1.12.2-6.1.10-dist.jar          | None                                     |     | LCHIJA | worldstatecheckpoints       | 1.12.2.1.2.1          | WorldStateCheckpoints-client-1.12.2.1.2.1.jar     | None                                     |     | LCHIJA | wrcbe                       | 2.3.2                 | WR-CBE-1.12.2-2.3.2.33-universal.jar              | f1850c39b2516232a2108a7bd84d1cb5df93b261 |     | LCHIJA | zoocraftdiscoveries         | 1.0                   | Zoocraft+Discoveries+1.12.2-1.3.0.jar             | None                                     |     | LCHIJA | immersiveengineering        | 0.12-98               | ImmersiveEngineering-0.12-98.jar                  | None                                     |     | LCHIJA | fix-rtm                     | 2.0.28                | fixRtm-2.0.28.jar                                 | None                                     |     | LCHIJA | mysticallib                 | 1.12.2-1.13.0         | mysticallib-1.12.2-1.13.0.jar                     | None                                     |     Loaded coremods (and transformers): ForgelinPlugin (Forgelin-1.8.3.jar)   PatchingFixRtmCorePlugin (fixRtm-2.0.28.jar)   com.anatawa12.fixRtm.asm.patching.PatchApplier IELoadingPlugin (ImmersiveEngineering-core-0.12-98.jar)   blusunrize.immersiveengineering.common.asm.IEClassTransformer FixRtmCorePlugin (fixRtm-2.0.28.jar)   JarInJarLoaderCoreMod (fixRtm-2.0.28.jar)   com.anatawa12.fixRtm.jarInJar.JarInJarPatcher BetterFoliageLoader (BetterFoliage-MC1.12-2.3.2.jar)   mods.betterfoliage.loader.BetterFoliageTransformer SecurityCraftLoadingPlugin ([1.12.2] SecurityCraft v1.9.9.jar)   OpenModsCorePlugin (OpenModsLib-1.12.2-0.12.2.jar)   openmods.core.OpenModsClassTransformer MalisisCorePlugin (MalisisCore-1.12.2.jar)   ObfuscatePlugin (obfuscate-0.4.2-1.12.2.jar)   com.mrcrayfish.obfuscate.asm.ObfuscateTransformer CTMCorePlugin (CTM-MC1.12.2-1.0.2.31.jar)   team.chisel.ctm.client.asm.CTMTransformer HookingFixRtmCorePlugin (fixRtm-2.0.28.jar)   com.anatawa12.fixRtm.asm.hooking.HookingTransformer     GL info: ' Vendor: 'NVIDIA Corporation' Version: '4.6.0 NVIDIA 551.86' Renderer: 'NVIDIA GeForce RTX 3070/PCIe/SSE2'     OpenModsLib class transformers: [llama_null_fix:FINISHED],[horse_base_null_fix:FINISHED],[pre_world_render_hook:FINISHED],[player_render_hook:FINISHED],[horse_null_fix:FINISHED]     RTM Model Status: Initialized 1048 models, Using 0 models     I = Initialized, C = Constructed, SMP = SMP includeds     | model pack                                      | all | I | C   | SMP |     |:----------------------------------------------- |:--- |:- |:--- |:--- |     | mods\ModelPack_Nak_5_Structure_240313.zip       | 458 | 0 | 458 | 0   |     | mods\RTM2.4.24-43_forge-1.12.2-14.23.2.2611.jar | 281 | 0 | 281 | 0   |     | mods\rtm_Saracalias Pack v0.2.01.zip            | 309 | 0 | 309 | 0   |     Launched Version: 1.12.2-forge-14.23.5.2859     LWJGL: 2.9.4     OpenGL: NVIDIA GeForce RTX 3070/PCIe/SSE2 GL version 4.6.0 NVIDIA 551.86, NVIDIA Corporation     GL Caps: Using GL 1.3 multitexturing. Using GL 1.3 texture combiners. Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported. Shaders are available because OpenGL 2.1 is supported. VBOs are available because OpenGL 1.5 is supported.     Using VBOs: Yes     Is Modded: Definitely; Client brand changed to 'fml,forge'     Type: Client (map_client.txt)     Resource Packs: NickMiner69V2.zip, MPT-4.zip, feldbahnpackv1-3.zip, G_P_Narrow_Gauge_Texel_Pack_V1.0.3.zip     Current Language: English (US)     Profiler Position: N/A (disabled)     CPU: 8x Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz     OptiFine Version: OptiFine_1.12.2_HD_U_G5     OptiFine Build: 20210124-142939     Render Distance Chunks: 12     Mipmaps: 4     Anisotropic Filtering: 1     Antialiasing: 0     Multitexture: false     Shaders: null     OpenGlVersion: 4.6.0 NVIDIA 551.86     OpenGlRenderer: NVIDIA GeForce RTX 3070/PCIe/SSE2     OpenGlVendor: NVIDIA Corporation     CpuCount: 8

i notice a change if i add the min and max ram in the line like this for example:    # Xmx and Xms set the maximum and minimum RAM usage, respectively. # They can take any number, followed by an M or a G. # M means Megabyte, G means Gigabyte. # For example, to set the maximum to 3GB: -Xmx3G # To set the minimum to 2.5GB: -Xms2500M # A good default for a modded server is 4GB. # Uncomment the next line to set it. -Xmx10240M -Xms8192M    i need to make more experiments but for now this apparently works.

This honestly might just work for you @SubscribeEvent public static void onScreenRender(ScreenEvent.Render.Post event) { final var player = Minecraft.getInstance().player; final var options = Minecraft.getInstance().options; if(!hasMyEffect(player)) return; // TODO: You provide hasMyEffect float f = Mth.lerp(event.getPartialTick(), player.oSpinningEffectIntensity, player.spinningEffectIntensity); float f1 = ((Double)options.screenEffectScale().get()).floatValue(); if(f <= 0F || f1 >= 1F) return; float p_282656_ = f * (1.0F - f1); final var p_282460_ = event.getGuiGraphics(); int i = p_282460_.guiWidth(); int j = p_282460_.guiHeight(); p_282460_.pose().pushPose(); float f5 = Mth.lerp(p_282656_, 2.0F, 1.0F); p_282460_.pose().translate((float)i / 2.0F, (float)j / 2.0F, 0.0F); p_282460_.pose().scale(f5, f5, f5); p_282460_.pose().translate((float)(-i) / 2.0F, (float)(-j) / 2.0F, 0.0F); float f4 = 0.2F * p_282656_; float f2 = 0.4F * p_282656_; float f3 = 0.2F * p_282656_; RenderSystem.disableDepthTest(); RenderSystem.depthMask(false); RenderSystem.enableBlend(); RenderSystem.blendFuncSeparate(GlStateManager.SourceFactor.ONE, GlStateManager.DestFactor.ONE, GlStateManager.SourceFactor.ONE, GlStateManager.DestFactor.ONE); p_282460_.setColor(f4, f2, f3, 1.0F); p_282460_.blit(new ResourceLocation("textures/misc/nausea.png"), 0, 0, -90, 0.0F, 0.0F, i, j, i, j); p_282460_.setColor(1.0F, 1.0F, 1.0F, 1.0F); RenderSystem.defaultBlendFunc(); RenderSystem.disableBlend(); RenderSystem.depthMask(true); RenderSystem.enableDepthTest(); p_282460_.pose().popPose(); }   Note: Most of this is directly copied from GameRenderer as you pointed out you found. The only thing you'll have to likely do is update the `oSpinningEffectIntensity` + `spinningEffectIntensity` variables on the player when your effect is applied. Which values should be there? Not 100% sure, might be a game of guess and check, but `handleNetherPortalClient` in LocalPlayer has some hard coded you might be able to start with.