Forge server won't start when I add mods

[Qetnuh]

Hi, I'm trying to make a modded Forge server so me and my friends can play together, but when I add the mods to the mods folder, I get an error. If I have the server by itself, no mods, everything runs fine. I don't know what is happening so if someone could please help that would be great. I left the crash report below.

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C:\Users\Hunter\Desktop\Forge>REM Forge requires a configured set of both JVM and program arguments.

C:\Users\Hunter\Desktop\Forge>REM Add custom JVM arguments to the user_jvm_args.txt

C:\Users\Hunter\Desktop\Forge>REM Add custom program arguments {such as nogui} to this file in the next line before the  or

C:\Users\Hunter\Desktop\Forge>REM  pass them to this script directly

C:\Users\Hunter\Desktop\Forge>java @user_jvm_args.txt @libraries/net/minecraftforge/forge/1.18.2-40.2.1/win_args.txt
2023-02-07 19:07:23,904 main WARN Advanced terminal features are not available in this environment
[19:07:24] [main/INFO] [cp.mo.mo.Launcher/MODLAUNCHER]: ModLauncher running: args [--launchTarget, forgeserver, --fml.forgeVersion, 40.2.1, --fml.mcVersion, 1.18.2, --fml.forgeGroup, net.minecraftforge, --fml.mcpVersion, 20220404.173914]
[19:07:24] [main/INFO] [cp.mo.mo.Launcher/MODLAUNCHER]: ModLauncher 9.1.3+9.1.3+main.9b69c82a starting: java version 19.0.2 by Oracle Corporation
[19:07:24] [main/INFO] [mixin/]: SpongePowered MIXIN Subsystem Version=0.8.5 Source=union:/C:/Users/Hunter/Desktop/Forge/libraries/org/spongepowered/mixin/0.8.5/mixin-0.8.5.jar%2314!/ Service=ModLauncher Env=SERVER
[19:07:24] [main/WARN] [ne.mi.fm.lo.mo.ModFileParser/LOADING]: Mod file C:\Users\Hunter\Desktop\Forge\libraries\net\minecraftforge\fmlcore\1.18.2-40.2.1\fmlcore-1.18.2-40.2.1.jar is missing mods.toml file
[19:07:24] [main/WARN] [ne.mi.fm.lo.mo.ModFileParser/LOADING]: Mod file C:\Users\Hunter\Desktop\Forge\libraries\net\minecraftforge\javafmllanguage\1.18.2-40.2.1\javafmllanguage-1.18.2-40.2.1.jar is missing mods.toml file
[19:07:24] [main/WARN] [ne.mi.fm.lo.mo.ModFileParser/LOADING]: Mod file C:\Users\Hunter\Desktop\Forge\libraries\net\minecraftforge\lowcodelanguage\1.18.2-40.2.1\lowcodelanguage-1.18.2-40.2.1.jar is missing mods.toml file
[19:07:24] [main/WARN] [ne.mi.fm.lo.mo.ModFileParser/LOADING]: Mod file C:\Users\Hunter\Desktop\Forge\libraries\net\minecraftforge\mclanguage\1.18.2-40.2.1\mclanguage-1.18.2-40.2.1.jar is missing mods.toml file
[19:07:24] [main/INFO] [ne.mi.fm.lo.mo.JarInJarDependencyLocator/]: Found 24 dependencies adding them to mods collection[19:07:25] [main/INFO] [mixin/]: Compatibility level set to JAVA_17
[19:07:25] [main/INFO] [cp.mo.mo.LaunchServiceHandler/MODLAUNCHER]: Launching target 'forgeserver' with arguments []
[19:07:26] [main/WARN] [mixin/]: Reference map 'eureka-forge-refmap.json' for vs_eureka.mixins.json could not be read. If this is a development environment you can ignore this message
[19:07:26] [main/WARN] [mixin/]: Error loading class: dev/ftb/mods/ftbchunks/data/ClaimedChunkManager (java.lang.ClassNotFoundException: dev.ftb.mods.ftbchunks.data.ClaimedChunkManager)
[19:07:26] [main/WARN] [mixin/]: Error loading class: dan200/computercraft/shared/peripheral/speaker/SpeakerPosition (java.lang.ClassNotFoundException: dan200.computercraft.shared.peripheral.speaker.SpeakerPosition)
[19:07:26] [main/WARN] [mixin/]: Error loading class: dan200/computercraft/shared/turtle/core/TurtleBrain (java.lang.ClassNotFoundException: dan200.computercraft.shared.turtle.core.TurtleBrain)
[19:07:26] [main/WARN] [mixin/]: Error loading class: dan200/computercraft/shared/turtle/core/TurtleMoveCommand (java.lang.ClassNotFoundException: dan200.computercraft.shared.turtle.core.TurtleMoveCommand)
[19:07:26] [main/WARN] [mixin/]: Error loading class: dan200/computercraft/shared/peripheral/modem/wireless/WirelessNetwork (java.lang.ClassNotFoundException: dan200.computercraft.shared.peripheral.modem.wireless.WirelessNetwork)
[19:07:26] [main/WARN] [mixin/]: Error loading class: blusunrize/immersiveengineering/common/gui/BlockEntityInventory (java.lang.ClassNotFoundException: blusunrize.immersiveengineering.common.gui.BlockEntityInventory)
[19:07:26] [main/WARN] [mixin/]: Error loading class: cofh/core/block/entity/TileCoFH (java.lang.ClassNotFoundException: cofh.core.block.entity.TileCoFH)
[19:07:26] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19:07:26] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19:07:26] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19:07:26] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19:07:26] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19:07:26] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19:07:26] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19:07:26] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19:07:26] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19:07:26] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19:07:26] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19:07:26] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19:07:26] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19:07:26] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19:07:26] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19:07:26] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19:07:26] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19:07:26] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19:07:26] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19:07:26] [main/WARN] [mixin/]: Error loading class: java/util/concurrent/CompletableFuture (java.lang.IllegalArgumentException: Unsupported class file major version 63)
Exception in thread "main" org.spongepowered.asm.mixin.transformer.throwables.MixinTransformerError: An unexpected critical error was encountered
        at MC-BOOTSTRAP/org.spongepowered.mixin/org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:392)
        at MC-BOOTSTRAP/org.spongepowered.mixin/org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClass(MixinTransformer.java:250)
        at MC-BOOTSTRAP/org.spongepowered.mixin/org.spongepowered.asm.service.modlauncher.MixinTransformationHandler.processClass(MixinTransformationHandler.java:131)
        at MC-BOOTSTRAP/org.spongepowered.mixin/org.spongepowered.asm.launch.MixinLaunchPluginLegacy.processClass(MixinLaunchPluginLegacy.java:131)
        at MC-BOOTSTRAP/cpw.mods.modlauncher@9.1.3/cpw.mods.modlauncher.serviceapi.ILaunchPluginService.processClassWithFlags(ILaunchPluginService.java:156)
        at MC-BOOTSTRAP/cpw.mods.modlauncher@9.1.3/cpw.mods.modlauncher.LaunchPluginHandler.offerClassNodeToPlugins(LaunchPluginHandler.java:88)
        at MC-BOOTSTRAP/cpw.mods.modlauncher@9.1.3/cpw.mods.modlauncher.ClassTransformer.transform(ClassTransformer.java:120)
        at MC-BOOTSTRAP/cpw.mods.modlauncher@9.1.3/cpw.mods.modlauncher.TransformingClassLoader.maybeTransformClassBytes(TransformingClassLoader.java:50)
        at cpw.mods.securejarhandler@1.0.3/cpw.mods.cl.ModuleClassLoader.readerToClass(ModuleClassLoader.java:110)
        at cpw.mods.securejarhandler@1.0.3/cpw.mods.cl.ModuleClassLoader.lambda$findClass$16(ModuleClassLoader.java:216)        at cpw.mods.securejarhandler@1.0.3/cpw.mods.cl.ModuleClassLoader.loadFromModule(ModuleClassLoader.java:226)
        at cpw.mods.securejarhandler@1.0.3/cpw.mods.cl.ModuleClassLoader.findClass(ModuleClassLoader.java:216)
        at cpw.mods.securejarhandler@1.0.3/cpw.mods.cl.ModuleClassLoader.loadClass(ModuleClassLoader.java:132)
        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
        at java.base/java.lang.Class.getDeclaredMethods0(Native Method)
        at java.base/java.lang.Class.privateGetDeclaredMethods(Class.java:3458)
        at java.base/java.lang.Class.getMethodsRecursive(Class.java:3599)
        at java.base/java.lang.Class.getMethod0(Class.java:3585)
        at java.base/java.lang.Class.getMethod(Class.java:2275)
        at MC-BOOTSTRAP/fmlloader@1.18.2-40.2.1/net.minecraftforge.fml.loading.targets.CommonServerLaunchHandler.lambda$launchService$0(CommonServerLaunchHandler.java:32)
        at MC-BOOTSTRAP/cpw.mods.modlauncher@9.1.3/cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37)
        at MC-BOOTSTRAP/cpw.mods.modlauncher@9.1.3/cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:53)
        at MC-BOOTSTRAP/cpw.mods.modlauncher@9.1.3/cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:71)
        at MC-BOOTSTRAP/cpw.mods.modlauncher@9.1.3/cpw.mods.modlauncher.Launcher.run(Launcher.java:106)
        at MC-BOOTSTRAP/cpw.mods.modlauncher@9.1.3/cpw.mods.modlauncher.Launcher.main(Launcher.java:77)
        at MC-BOOTSTRAP/cpw.mods.modlauncher@9.1.3/cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:26)
        at MC-BOOTSTRAP/cpw.mods.modlauncher@9.1.3/cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:23)
        at cpw.mods.bootstraplauncher@1.0.0/cpw.mods.bootstraplauncher.BootstrapLauncher.main(BootstrapLauncher.java:149)
Caused by: org.spongepowered.asm.mixin.throwables.ClassMetadataNotFoundException: java.util.concurrent.CompletableFuture        at MC-BOOTSTRAP/org.spongepowered.mixin/org.spongepowered.asm.mixin.transformer.MixinPreProcessorStandard.transformMethod(MixinPreProcessorStandard.java:754)
        at MC-BOOTSTRAP/org.spongepowered.mixin/org.spongepowered.asm.mixin.transformer.MixinPreProcessorStandard.transform(MixinPreProcessorStandard.java:739)
        at MC-BOOTSTRAP/org.spongepowered.mixin/org.spongepowered.asm.mixin.transformer.MixinPreProcessorStandard.attach(MixinPreProcessorStandard.java:310)
        at MC-BOOTSTRAP/org.spongepowered.mixin/org.spongepowered.asm.mixin.transformer.MixinPreProcessorStandard.createContextFor(MixinPreProcessorStandard.java:280)
        at MC-BOOTSTRAP/org.spongepowered.mixin/org.spongepowered.asm.mixin.transformer.MixinInfo.createContextFor(MixinInfo.java:1288)
        at MC-BOOTSTRAP/org.spongepowered.mixin/org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.apply(MixinApplicatorStandard.java:292)
        at MC-BOOTSTRAP/org.spongepowered.mixin/org.spongepowered.asm.mixin.transformer.TargetClassContext.apply(TargetClassContext.java:383)
        at MC-BOOTSTRAP/org.spongepowered.mixin/org.spongepowered.asm.mixin.transformer.TargetClassContext.applyMixins(TargetClassContext.java:365)
        at MC-BOOTSTRAP/org.spongepowered.mixin/org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:363)
        ... 27 more

 

[Hipposgrumm]

The mods you are using use Mixin.

You are using Java 19. Java 19 breaks Mixin somehow.

You must downgrade to Java 17.

Edited February 8, 2023 by Hipposgrumm
You're Welcome :)

[Qetnuh]

  On 2/8/2023 at 2:48 AM, Hipposgrumm said:

The mods you are using use Mixin.

You are using Java 19. Java 19 breaks Mixin somehow.

You must downgrade to Java 17.

Expand  

Ok, I tried this but now when I open run.bat, inside the cmd it just says Forge>pause, but no errors. I tried redownloading Java 19 and it gave me the errors then, so I dunno what's happening with that. Do you have any other solutions?

[Hipposgrumm]

I think it's just a bunch of Java path stuff I really don't know how to do of the top of my head. You will have to Google how to change Java path or how to downgrade Java.