Posted April 26, 20223 yr My mod works and is able to fully load when in Eclipse, the runClient task works without issue, but when I build the mod and run the jar file on the same Forge version as my MDK (36.2.34) it crashes with the error "java.lang.ClassFormatError: Duplicate method name "func_200929_c" with signature "()F" in class file sword/red/main/init/ModItemTier$ModItemTiers" This is the crash report and file stated from the mod. package sword.red.main.init; import java.util.function.Supplier; import net.minecraft.item.IItemTier; import net.minecraft.item.crafting.Ingredient; import net.minecraft.util.IItemProvider; import net.minecraft.util.LazyValue; public class ModItemTier { public static enum ModItemTiers implements IItemTier { PHOCKTONIUM(4, 4500, 12.0f, 8.0f, 100, () -> Ingredient.of((IItemProvider[])new IItemProvider[]{ModItemRegistry.PHOCKTONIUM_INGOT.get()})); private final int harvestLevel; private final int maxUses; private final int enchantability; private final float attackDamage; private final float efficiency; private final LazyValue<Ingredient> repairMaterial; private ModItemTiers(int harvestLevel, int maxUses, float efficency, float attackDamage, int enchantability, Supplier<Ingredient> repairMaterial) { this.harvestLevel = harvestLevel; this.maxUses = maxUses; this.efficiency = efficency; this.attackDamage = attackDamage; this.enchantability = enchantability; this.repairMaterial = new LazyValue<Ingredient>(repairMaterial); } public float func_200929_c() { return this.attackDamage; } public float func_200928_b() { return this.efficiency; } public int func_200927_e() { return this.enchantability; } public int func_200925_d() { return this.harvestLevel; } public int func_200926_a() { return this.maxUses; } public Ingredient func_200924_f() { return (Ingredient)this.repairMaterial.get(); } @Override public float getAttackDamageBonus() { // TODO Auto-generated method stub return 0; } @Override public int getEnchantmentValue() { // TODO Auto-generated method stub return 0; } @Override public int getLevel() { // TODO Auto-generated method stub return 0; } @Override public Ingredient getRepairIngredient() { // TODO Auto-generated method stub return null; } @Override public float getSpeed() { // TODO Auto-generated method stub return 0; } @Override public int getUses() { // TODO Auto-generated method stub return 0; } } } ---- Minecraft Crash Report ---- // You should try our sister game, Minceraft! Time: 4/26/22 6:43 PM Description: Mod loading error has occurred java.lang.Exception: Mod Loading has failed at net.minecraftforge.fml.CrashReportExtender.dumpModLoadingCrashReport(CrashReportExtender.java:85) ~[forge:?] {re:classloading} at net.minecraftforge.fml.client.ClientModLoader.completeModLoading(ClientModLoader.java:188) ~[forge:?] {re:classloading,pl:runtimedistcleaner:A} at net.minecraft.client.Minecraft.lambda$null$1(Minecraft.java:508) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A} at net.minecraft.util.Util.func_215077_a(Util.java:320) ~[?:?] {re:classloading} at net.minecraft.client.Minecraft.lambda$new$2(Minecraft.java:504) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A} at net.minecraft.client.gui.ResourceLoadProgressGui.func_230430_a_(ResourceLoadProgressGui.java:113) ~[?:?] {re:classloading,pl:runtimedistcleaner:A} at net.minecraft.client.renderer.GameRenderer.func_195458_a(GameRenderer.java:481) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A} at net.minecraft.client.Minecraft.func_195542_b(Minecraft.java:977) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A} at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:607) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A} at net.minecraft.client.main.Main.main(Main.java:184) ~[client-1.16.5.jar:?] {re:classloading,pl:runtimedistcleaner:A} at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_281] {} at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_281] {} at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_281] {} at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_281] {} at net.minecraftforge.fml.loading.FMLClientLaunchProvider.lambda$launchService$0(FMLClientLaunchProvider.java:51) ~[forge-1.16.5-36.2.34.jar:36.2] {} at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) [modlauncher-8.1.3.jar:?] {} at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54) [modlauncher-8.1.3.jar:?] {} at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72) [modlauncher-8.1.3.jar:?] {} at cpw.mods.modlauncher.Launcher.run(Launcher.java:82) [modlauncher-8.1.3.jar:?] {} at cpw.mods.modlauncher.Launcher.main(Launcher.java:66) [modlauncher-8.1.3.jar:?] {} A detailed walkthrough of the error, its code path and all known details is as follows: --------------------------------------------------------------------------------------- -- Head -- Thread: Render thread Stacktrace: at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.8.0_281] {} -- MOD phocktoniumtoolsmod -- Details: Mod File: output.jar Failure message: Phocktonium Tools (phocktoniumtoolsmod) encountered an error during the load_registries event phase java.lang.ClassFormatError: Duplicate method name "func_200929_c" with signature "()F" in class file sword/red/main/init/ModItemTier$ModItemTiers Mod Version: 2.2 Mod Issue URL: http://my.issue.tracker/ Exception message: java.lang.ClassFormatError: Duplicate method name "func_200929_c" with signature "()F" in class file sword/red/main/init/ModItemTier$ModItemTiers Stacktrace: at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.8.0_281] {} at java.lang.ClassLoader.defineClass(ClassLoader.java:756) ~[?:1.8.0_281] {} at cpw.mods.modlauncher.TransformingClassLoader.loadClass(TransformingClassLoader.java:138) ~[modlauncher-8.1.3.jar:?] {re:classloading} at cpw.mods.modlauncher.TransformingClassLoader.loadClass(TransformingClassLoader.java:98) ~[modlauncher-8.1.3.jar:?] {re:classloading} at java.lang.ClassLoader.loadClass(ClassLoader.java:351) ~[?:1.8.0_281] {} at sword.red.main.ModEventSubscriber.onRegisterItems(ModEventSubscriber.java:34) ~[phocktoniumtoolsmod:2.2] {re:classloading} at net.minecraftforge.eventbus.ASMEventHandler_7_ModEventSubscriber_onRegisterItems_Register.invoke(.dynamic) ~[?:?] {} at net.minecraftforge.eventbus.ASMEventHandler.invoke(ASMEventHandler.java:85) ~[eventbus-4.0.0.jar:?] {} at net.minecraftforge.eventbus.EventBus.post(EventBus.java:302) ~[eventbus-4.0.0.jar:?] {} at net.minecraftforge.eventbus.EventBus.post(EventBus.java:283) ~[eventbus-4.0.0.jar:?] {} at net.minecraftforge.fml.javafmlmod.FMLModContainer.acceptEvent(FMLModContainer.java:120) ~[forge:36.2] {re:classloading} at net.minecraftforge.fml.ModContainer.lambda$buildTransitionHandler$4(ModContainer.java:121) ~[forge:?] {re:classloading} at java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1640) ~[?:1.8.0_281] {} at net.minecraftforge.fml.ModWorkManager$SyncExecutor.driveOne(ModWorkManager.java:56) ~[forge:?] {re:classloading} at net.minecraftforge.fml.ModWorkManager$DrivenExecutor.drive(ModWorkManager.java:40) ~[forge:?] {re:classloading} at net.minecraftforge.fml.ModLoader.waitForTransition(ModLoader.java:249) ~[forge:?] {re:classloading} at net.minecraftforge.fml.ModLoader.dispatchAndHandleError(ModLoader.java:236) ~[forge:?] {re:classloading} at net.minecraftforge.fml.ModLoader.gatherAndInitializeMods(ModLoader.java:202) ~[forge:?] {re:classloading} at net.minecraftforge.fml.client.ClientModLoader.lambda$begin$1(ClientModLoader.java:103) ~[forge:?] {re:classloading,pl:runtimedistcleaner:A} at net.minecraftforge.fml.client.ClientModLoader.lambda$createRunnableWithCatch$4(ClientModLoader.java:123) ~[forge:?] {re:classloading,pl:runtimedistcleaner:A} at net.minecraftforge.fml.client.ClientModLoader.begin(ClientModLoader.java:103) ~[forge:?] {re:classloading,pl:runtimedistcleaner:A} at net.minecraft.client.Minecraft.<init>(Minecraft.java:437) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A} at net.minecraft.client.main.Main.main(Main.java:149) ~[client-1.16.5.jar:?] {re:classloading,pl:runtimedistcleaner:A} at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_281] {} at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_281] {} at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_281] {} at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_281] {} at net.minecraftforge.fml.loading.FMLClientLaunchProvider.lambda$launchService$0(FMLClientLaunchProvider.java:51) ~[forge-1.16.5-36.2.34.jar:36.2] {} at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) [modlauncher-8.1.3.jar:?] {} at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54) [modlauncher-8.1.3.jar:?] {} at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72) [modlauncher-8.1.3.jar:?] {} at cpw.mods.modlauncher.Launcher.run(Launcher.java:82) [modlauncher-8.1.3.jar:?] {} at cpw.mods.modlauncher.Launcher.main(Launcher.java:66) [modlauncher-8.1.3.jar:?] {} -- System Details -- Details: Minecraft Version: 1.16.5 Minecraft Version ID: 1.16.5 Operating System: Windows 10 (amd64) version 10.0 Java Version: 1.8.0_281, Oracle Corporation Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation Memory: 1283733216 bytes (1224 MB) / 2235039744 bytes (2131 MB) up to 5249695744 bytes (5006 MB) CPUs: 4 JVM Flags: 7 total; -XX:-OmitStackTraceInFastThrow -Xms512M -Xmx5632M -XX:MetaspaceSize=352M -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -XX:+IgnoreUnrecognizedVMOptions ModLauncher: 8.1.3+8.1.3+main-8.1.x.c94d18ec ModLauncher launch target: fmlclient ModLauncher naming: srg ModLauncher services: /mixin-0.8.4.jar mixin PLUGINSERVICE /eventbus-4.0.0.jar eventbus PLUGINSERVICE /forge-1.16.5-36.2.34.jar object_holder_definalize PLUGINSERVICE /forge-1.16.5-36.2.34.jar runtime_enum_extender PLUGINSERVICE /accesstransformers-3.0.1.jar accesstransformer PLUGINSERVICE /forge-1.16.5-36.2.34.jar capability_inject_definalize PLUGINSERVICE /forge-1.16.5-36.2.34.jar runtimedistcleaner PLUGINSERVICE /mixin-0.8.4.jar mixin TRANSFORMATIONSERVICE /forge-1.16.5-36.2.34.jar fml TRANSFORMATIONSERVICE FML: 36.2 Forge: net.minecraftforge:36.2.34 FML Language Providers: [email protected] minecraft@1 Mod List: forge-1.16.5-36.2.34-client.jar |Minecraft |minecraft |1.16.5 |COMMON_SET|Manifest: NOSIGNATURE output.jar |Phocktonium Tools |phocktoniumtoolsmod |2.2 |VALIDATE |Manifest: NOSIGNATURE forge-1.16.5-36.2.34-universal.jar |Forge |forge |36.2.34 |COMMON_SET|Manifest: 22:af:21:d8:19:82:7f:93:94:fe:2b:ac:b7:e4:41:57:68:39:87:b1:a7:5c:c6:44:f9:25:74:21:14:f5:0d:90 Crash Report UUID: 6d8b3ea4-ac40-4eb7-9735-02f80058dc20
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