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{Solved}Forge 1.12.2 crashing before the window pops up


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If I remove mods, it loads fine. Here are the logs;[03:23:04] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[03:23:04] [main/INFO] [LaunchWrapper]: Using primary tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[03:23:04] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLTweaker
[03:23:04] [main/INFO] [FML]: Forge Mod Loader version 14.23.5.2854 for Minecraft 1.12.2 loading
[03:23:04] [main/INFO] [FML]: Java is Java HotSpot(TM) 64-Bit Server VM, version 1.8.0_51, running on Windows 10:amd64:10.0, installed at C:\Program Files (x86)\Minecraft Launcher\runtime\jre-x64
[03:23:05] [main/INFO] [FML]: Searching C:\Users\AppData\Roaming\.minecraft\mods for mods
[03:23:05] [main/INFO] [FML]: Searching C:\Users\AppData\Roaming\.minecraft\mods\1.12.2 for mods
[03:23:05] [main/WARN] [FML]: Found FMLCorePluginContainsFMLMod marker in BetterFoliage-MC1.12-2.3.1.jar. This is not recommended, @Mods should be in a separate jar from the coremod.
[03:23:05] [main/WARN] [FML]: The coremod BetterFoliageLoader (mods.betterfoliage.loader.BetterFoliageLoader) is not signed!
[03:23:05] [main/INFO] [FML]: Loading tweaker guichaguri.betterfps.tweaker.BetterFpsTweaker from BetterFps-1.4.8.jar
[03:23:05] [main/INFO] [FML]: Loading tweaker codechicken.asm.internal.Tweaker from ChickenASM-1.12-1.0.2.7.jar
[03:23:05] [main/WARN] [FML]: Found FMLCorePluginContainsFMLMod marker in CreativeCore_v1.10.20_mc1.12.2.jar. This is not recommended, @Mods should be in a separate jar from the coremod.
[03:23:05] [main/WARN] [FML]: The coremod com.creativemd.creativecore.core.CreativePatchingLoader does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[03:23:05] [main/WARN] [FML]: The coremod CreativePatchingLoader (com.creativemd.creativecore.core.CreativePatchingLoader) is not signed!
[03:23:05] [main/WARN] [FML]: Found FMLCorePluginContainsFMLMod marker in DynamicLights-1.12.2.jar. This is not recommended, @Mods should be in a separate jar from the coremod.
[03:23:05] [main/WARN] [FML]: The coremod atomicstryker.dynamiclights.common.DLFMLCorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[03:23:05] [main/WARN] [FML]: The coremod DLFMLCorePlugin (atomicstryker.dynamiclights.common.DLFMLCorePlugin) is not signed!
[03:23:05] [main/INFO] [FML]: Loading tweaker org.spongepowered.asm.launch.MixinTweaker from DynamicSurroundings-1.12.2-3.6.1.0.jar
[03:23:05] [main/WARN] [FML]: Found FMLCorePluginContainsFMLMod marker in HardcoreDarkness-MC1.12.2-2.0.jar. This is not recommended, @Mods should be in a separate jar from the coremod.
[03:23:05] [main/WARN] [FML]: The coremod lumien.hardcoredarkness.asm.LoadingPlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[03:23:05] [main/WARN] [FML]: Found FMLCorePluginContainsFMLMod marker in iceandfire-1.9.1-1.12.2.jar. This is not recommended, @Mods should be in a separate jar from the coremod.
[03:23:05] [main/WARN] [FML]: The coremod iceandfire (com.github.alexthe666.iceandfire.asm.IceAndFirePlugin) is not signed!
[03:23:05] [main/WARN] [FML]: Found FMLCorePluginContainsFMLMod marker in InventoryTweaks-1.63.jar. This is not recommended, @Mods should be in a separate jar from the coremod.
[03:23:05] [main/WARN] [FML]: The coremod invtweaks.forge.asm.FMLPlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[03:23:05] [main/WARN] [FML]: Found FMLCorePluginContainsFMLMod marker in ISeeDragons-0.12.jar. This is not recommended, @Mods should be in a separate jar from the coremod.
[03:23:05] [main/WARN] [FML]: The coremod FMLCorePlugin (io.github.xcube16.iseedragons.FMLCorePlugin) is not signed!
[03:23:05] [main/WARN] [FML]: The coremod ivorius.ivtoolkit.IvToolkitLoadingPlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[03:23:05] [main/WARN] [FML]: The coremod IvToolkit (ivorius.ivtoolkit.IvToolkitLoadingPlugin) is not signed!
[03:23:05] [main/INFO] [FML]: Loading tweaker org.spongepowered.asm.launch.MixinTweaker from movingworld-1.12-6.353-full.jar
[03:23:05] [main/INFO] [FML]: Loading tweaker optifine.OptiFineForgeTweaker from OptiFine_1.12.2_HD_U_F5_MOD.jar
[03:23:05] [main/WARN] [FML]: Found FMLCorePluginContainsFMLMod marker in Quark-r1.6-179.jar. This is not recommended, @Mods should be in a separate jar from the coremod.
[03:23:05] [main/WARN] [FML]: The coremod Quark Plugin (vazkii.quark.base.asm.LoadingPlugin) is not signed!
[03:23:05] [main/WARN] [FML]: Found FMLCorePluginContainsFMLMod marker in StalkerCreepers-1.12.1.jar. This is not recommended, @Mods should be in a separate jar from the coremod.
[03:23:05] [main/WARN] [FML]: The coremod atomicstryker.stalkercreepers.common.SCFMLCorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[03:23:05] [main/WARN] [FML]: The coremod SCFMLCorePlugin (atomicstryker.stalkercreepers.common.SCFMLCorePlugin) is not signed!
[03:23:05] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[03:23:05] [main/INFO] [LaunchWrapper]: Loading tweak class name guichaguri.betterfps.tweaker.BetterFpsTweaker
[03:23:05] [main/INFO] [LaunchWrapper]: Loading tweak class name codechicken.asm.internal.Tweaker
[03:23:05] [main/INFO] [LaunchWrapper]: Loading tweak class name org.spongepowered.asm.launch.MixinTweaker
[03:23:05] [main/INFO] [mixin]: SpongePowered MIXIN Subsystem Version=0.8 Source=file:/C:/Users/AppData/Roaming/.minecraft/mods/1.12.2/DynamicSurroundings-1.12.2-3.6.1.0.jar Service=LaunchWrapper Env=CLIENT
[03:23:05] [main/INFO] [mixin]: Compatibility level set to JAVA_8
[03:23:05] [main/WARN] [FML]: The coremod com.elytradev.movingworld.common.asm.coremod.MovingWorldCoreMod does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[03:23:05] [main/WARN] [FML]: The coremod MovingWorldCore (com.elytradev.movingworld.common.asm.coremod.MovingWorldCoreMod) is not signed!
[03:23:05] [main/ERROR] [mixin]: Mixin config mixins.movingworld.json does not specify "minVersion" property
[03:23:05] [main/WARN] [LaunchWrapper]: Tweak class name org.spongepowered.asm.launch.MixinTweaker has already been visited -- skipping
[03:23:05] [main/INFO] [LaunchWrapper]: Loading tweak class name optifine.OptiFineForgeTweaker
[03:23:05] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLDeobfTweaker
[03:23:05] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[03:23:05] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[03:23:05] [main/INFO] [LaunchWrapper]: Calling tweak class optifine.OptiFineForgeTweaker
[03:23:05] [main/INFO] [STDOUT]: [optifine.OptiFineForgeTweaker:dbg:56]: OptiFineForgeTweaker: acceptOptions
[03:23:05] [main/INFO] [STDOUT]: [optifine.OptiFineForgeTweaker:dbg:56]: OptiFineForgeTweaker: injectIntoClassLoader
[03:23:05] [main/INFO] [STDOUT]: [optifine.OptiFineClassTransformer:dbg:242]: OptiFine ClassTransformer
[03:23:05] [main/INFO] [STDOUT]: [optifine.OptiFineClassTransformer:dbg:242]: OptiFine ZIP file: C:\Users\AppData\Roaming\.minecraft\mods\1.12.2\OptiFine_1.12.2_HD_U_F5_MOD.jar
[03:23:05] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[03:23:07] [main/INFO] [FML]: Found valid fingerprint for Minecraft Forge. Certificate fingerprint e3c3d50c7c986df74c645c0ac54639741c90a557
[03:23:07] [main/INFO] [FML]: Found valid fingerprint for Minecraft. Certificate fingerprint cd99959656f753dc28d863b46769f7f8fbaefcfc
[03:23:07] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[03:23:07] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[03:23:07] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[03:23:07] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[03:23:07] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[03:23:07] [main/INFO] [LaunchWrapper]: Calling tweak class codechicken.asm.internal.Tweaker
[03:23:07] [main/INFO] [STDOUT]: [codechicken.asm.internal.Tweaker:injectIntoClassLoader:30]: false
[03:23:07] [main/INFO] [LaunchWrapper]: Calling tweak class org.spongepowered.asm.launch.MixinTweaker
[03:23:07] [main/INFO] [mixin]: Initialised Mixin FML Remapper Adapter with net.minecraftforge.fml.common.asm.transformers.deobf.FMLDeobfuscatingRemapper@3c4262d1
[03:23:07] [main/INFO] [LaunchWrapper]: Calling tweak class guichaguri.betterfps.tweaker.BetterFpsTweaker
[03:23:07] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLDeobfTweaker
[03:23:07] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[03:23:07] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[03:23:07] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[03:23:07] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[03:23:07] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[03:23:07] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[03:23:07] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[03:23:07] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: java.lang.NoClassDefFoundError: kotlin/reflect/KDeclarationContainer
[03:23:07] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]:     at mods.betterfoliage.loader.Refs.<clinit>(Refs.kt:13)
[03:23:07] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]:     at mods.betterfoliage.loader.BetterFoliageTransformer.<init>(BetterFoliageCore.kt:13)
[03:23:07] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]:     at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
[03:23:07] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]:     at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
[03:23:07] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]:     at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
[03:23:07] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]:     at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
[03:23:07] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]:     at java.lang.Class.newInstance(Class.java:442)
[03:23:07] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]:     at net.minecraftforge.fml.common.asm.ASMTransformerWrapper$TransformerWrapper.<init>(ASMTransformerWrapper.java:243)
[03:23:07] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]:     at $wrapper.mods.betterfoliage.loader.BetterFoliageTransformer.<init>(Unknown Source)
[03:23:07] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]:     at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
[03:23:07] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]:     at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
[03:23:07] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]:     at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
[03:23:07] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]:     at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
[03:23:07] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]:     at java.lang.Class.newInstance(Class.java:442)
[03:23:07] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]:     at net.minecraft.launchwrapper.LaunchClassLoader.registerTransformer(LaunchClassLoader.java:88)
[03:23:07] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]:     at net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper.injectIntoClassLoader(CoreModManager.java:132)
[03:23:07] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]:     at net.minecraft.launchwrapper.Launch.launch(Launch.java:115)
[03:23:07] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]:     at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
[03:23:07] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]: Caused by: java.lang.ClassNotFoundException: kotlin.reflect.KDeclarationContainer
[03:23:07] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]:     at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
[03:23:07] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]:     at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:117)
[03:23:07] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]:     at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
[03:23:07] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]:     at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
[03:23:07] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]:     ... 18 more

 

I have 63 mods, and I had 80+, but wanted to switch some mods for others. I tried, but now it crashes. Any help?

Edited by Guy:)
I fixed the issue
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    • I also have the same question, thank you for sharing it and I also found the answer.
    • So I had no clue what topic to put this under because its not really modding with forge but modding forge itself. So I have terrain generation mods that are only server side and Bungeecord that has Geyser packet translator so people on bedrock edition can play as well, but when a bedrock player connects it gets a unknown packet error. I tested the proxy on a Spigot server verifying it was forge. With no mods installed I still get the error. I got a wireshark log of it all and I found the packet where it aborts the connection due to the invalid packet but I have no clue how to stop it. When I still had the mods installed I disabled the forge handshake protocol but it did not fix the issue. If you know what part of forge is doing this or a way to fix it all together that would be awesome. I know modifying forge can end really baddy (definitely the handshake protocol) but I think that is my only fix here. Im open to any suggestions tho. I have run out of ideas to fix it so any help would be nice. Also it seems the packet id causing the connection error is 0xFE but im not sure cause the client also sends back a packet with that ID. I have a whole bunch of info collected so if you need any more information on the issue, I willing to give it, just not the ips on the wireshark log.
    • Okay, I got it working correctly now, but I'm not sure how to make it work with multiple blocks.   My Block Code:   package expanded.blocks; import javax.annotation.Nullable; import expanded.VanillaBuildingBlocks; import net.minecraft.block.BlockState; import net.minecraft.block.RotatedPillarBlock; import net.minecraft.entity.player.PlayerEntity; import net.minecraft.item.ItemStack; import net.minecraft.util.math.BlockPos; import net.minecraft.world.World; import net.minecraftforge.common.ToolType; public class CustomLog extends RotatedPillarBlock {            public CustomLog(Properties properties) {         super(properties);     }      @Override     @Nullable     public BlockState getToolModifiedState(BlockState state, World world, BlockPos pos, PlayerEntity player, ItemStack stack, ToolType toolType) {         return toolType == ToolType.AXE ? VanillaBuildingBlocks.acacia_log.defaultBlockState() : null;     } }
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    • Ya but I'm not sure how I would actually add/implement it into the class correctly, and then registering the block correctly in my register class.
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