Hi everybody,

I'm new here, please be kind. I have an issue when installing some mods in my server file. "Like it would miss something". I looked for many posts and this error is pretty common but I couldn't find any solution

Steps that I did:

Installed: forge-1.18.2-40.2.0-installer.jar
Changed file user_jvm_args.txt for 8GB RAM
Run.bat
Changed eula.txt to true
Server started

Opened libraries/net/minecraftforge/forge/1.18.2-40.2.0: Copied all files and Pasted them in root folder in this case "server"

Run.bat looked like it loaded forge

Proceeded to paste jei mod inside the mods folder

Run.bat

All good

Proceeded to paste all mods that I would like to use

Run.bat
Error:

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

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

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

C:\Users\Leo\Desktop\Server>REM  pass them to this script directly

C:\Users\Leo\Desktop\Server>java @user_jvm_args.txt @libraries/net/minecraftforge/forge/1.18.2-40.2.0/win_args.txt
2023-03-11 20:08:22,353 main WARN Advanced terminal features are not available in this environment
[20:08:22] [main/INFO] [cp.mo.mo.Launcher/MODLAUNCHER]: ModLauncher running: args [--launchTarget, forgeserver, --fml.forgeVersion, 40.2.0, --fml.mcVersion, 1.18.2, --fml.forgeGroup, net.minecraftforge, --fml.mcpVersion, 20220404.173914]
[20:08:22] [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
[20:08:22] [main/INFO] [mixin/]: SpongePowered MIXIN Subsystem Version=0.8.5 Source=union:/C:/Users/Leo/Desktop/Server/libraries/org/spongepowered/mixin/0.8.5/mixin-0.8.5.jar%2314!/ Service=ModLauncher Env=SERVER
[20:08:23] [main/WARN] [ne.mi.fm.lo.mo.ModFileParser/LOADING]: Mod file C:\Users\Leo\Desktop\Server\libraries\net\minecraftforge\fmlcore\1.18.2-40.2.0\fmlcore-1.18.2-40.2.0.jar is missing mods.toml file
[20:08:23] [main/WARN] [ne.mi.fm.lo.mo.ModFileParser/LOADING]: Mod file C:\Users\Leo\Desktop\Server\libraries\net\minecraftforge\javafmllanguage\1.18.2-40.2.0\javafmllanguage-1.18.2-40.2.0.jar is missing mods.toml file
[20:08:23] [main/WARN] [ne.mi.fm.lo.mo.ModFileParser/LOADING]: Mod file C:\Users\Leo\Desktop\Server\libraries\net\minecraftforge\lowcodelanguage\1.18.2-40.2.0\lowcodelanguage-1.18.2-40.2.0.jar is missing mods.toml file
[20:08:23] [main/WARN] [ne.mi.fm.lo.mo.ModFileParser/LOADING]: Mod file C:\Users\Leo\Desktop\Server\libraries\net\minecraftforge\mclanguage\1.18.2-40.2.0\mclanguage-1.18.2-40.2.0.jar is missing mods.toml file
[20:08:23] [main/INFO] [ne.mi.fm.lo.mo.JarInJarDependencyLocator/]: No dependencies to load found. Skipping!
[20:08:24] [main/INFO] [mixin/]: Compatibility level set to JAVA_17
[20:08:24] [main/ERROR] [mixin/]: Mixin config rottencreatures-common.mixins.json does not specify "minVersion" property
[20:08:24] [main/ERROR] [mixin/]: Mixin config rottencreatures.mixins.json does not specify "minVersion" property
[20:08:24] [main/INFO] [cp.mo.mo.LaunchServiceHandler/MODLAUNCHER]: Launching target 'forgeserver' with arguments []
[20:08:24] [main/WARN] [mixin/]: Reference map 'rottencreatures-forge-refmap.json' for rottencreatures.mixins.json could not be read. If this is a development environment you can ignore this message
[20:08:24] [main/WARN] [mixin/]: Error loading class: net/minecraft/world/item/ItemStack (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[20:08:24] [main/WARN] [mixin/]: @Mixin target net.minecraft.world.item.ItemStack was not found creatures-and-beasts.mixins.json:MixinItemStack
[20:08:25] [main/WARN] [mixin/]: Error loading class: net/minecraft/client/model/IronGolemModel (java.lang.ClassNotFoundException: net.minecraft.client.model.IronGolemModel)
[20:08:25] [main/WARN] [mixin/]: @Mixin target net.minecraft.client.model.IronGolemModel was not found strawgolem.mixins.json:IronGolemModelMixin
[20:08:25] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[20:08:25] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[20:08:25] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[20:08:25] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[20:08:25] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[20:08:25] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[20:08:25] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[20:08:25] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[20:08:25] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[20:08:25] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[20:08:25] [main/WARN] [mixin/]: Error loading class: java/util/Map$Entry (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[20:08:25] [main/WARN] [mixin/]: Error loading class: java/util/concurrent/CompletableFuture (java.lang.IllegalArgumentException: Unsupported class file major version 63)
Exception in thread "main" org.spongepowered.asm.mixin.transformer.throwables.MixinTransformerError: An unexpected critical error was encountered
        at MC-BOOTSTRAP/org.spongepowered.mixin/org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:392)
        at MC-BOOTSTRAP/org.spongepowered.mixin/org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClass(MixinTransformer.java:250)
        at MC-BOOTSTRAP/org.spongepowered.mixin/org.spongepowered.asm.service.modlauncher.MixinTransformationHandler.processClass(MixinTransformationHandler.java:131)
        at MC-BOOTSTRAP/org.spongepowered.mixin/org.spongepowered.asm.launch.MixinLaunchPluginLegacy.processClass(MixinLaunchPluginLegacy.java:131)
        at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.serviceapi.ILaunchPluginService.processClassWithFlags(ILaunchPluginService.java:156)
        at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.LaunchPluginHandler.offerClassNodeToPlugins(LaunchPluginHandler.java:88)
        at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.ClassTransformer.transform(ClassTransformer.java:120)
        at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.TransformingClassLoader.maybeTransformClassBytes(TransformingClassLoader.java:50)
        at [email protected]/cpw.mods.cl.ModuleClassLoader.readerToClass(ModuleClassLoader.java:110)
        at [email protected]/cpw.mods.cl.ModuleClassLoader.lambda$findClass$16(ModuleClassLoader.java:216)
        at [email protected]/cpw.mods.cl.ModuleClassLoader.loadFromModule(ModuleClassLoader.java:226)
        at [email protected]/cpw.mods.cl.ModuleClassLoader.findClass(ModuleClassLoader.java:216)
        at [email protected]/cpw.mods.cl.ModuleClassLoader.loadClass(ModuleClassLoader.java:132)
        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
        at java.base/java.lang.Class.getDeclaredMethods0(Native Method)
        at java.base/java.lang.Class.privateGetDeclaredMethods(Class.java:3458)
        at java.base/java.lang.Class.getMethodsRecursive(Class.java:3599)
        at java.base/java.lang.Class.getMethod0(Class.java:3585)
        at java.base/java.lang.Class.getMethod(Class.java:2275)
        at MC-BOOTSTRAP/[email protected]/net.minecraftforge.fml.loading.targets.CommonServerLaunchHandler.lambda$launchService$0(CommonServerLaunchHandler.java:32)
        at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37)
        at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:53)
        at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:71)
        at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.Launcher.run(Launcher.java:106)
        at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.Launcher.main(Launcher.java:77)
        at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:26)
        at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:23)
        at [email protected]/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

C:\Users\Leo\Desktop\Server>pause
Press any key to continue . . .

So it's missing some files, but witch ones? Any ideas? Thanks a lot for your time!

 

Use java 17, not 19

Make sure your using a bit of an older java version and not the latest version. Like PowerfulTiger said, use J17. If you still have issues with that, you could try playing around with some different versions, I've had some issues getting it working before so the one I've been using has been J8 update 361, which to get I had to download it from the Oracle archive and then go to configure java and update it from there when I got it. I highly recommend using later versions like 17 as stated before since it's a lot easier to get working and can run better, but if you still have issues try to play around with what version your using a bit. For forge version, whenever you make a server to prevent issues make sure you use the same version of forge on the server as the mods your using. When you make a modpack on curseforge itll default to the recommend version, so if you use that make sure you download the recommended version from Forge as well for the server. Make sure you also don't allocate too much memory when starting a server as more memory can also slow down preformance. For my ~160 mod server with about 4 people on it at one time I use 8GB. If you have any more questions or need any help don't be afraid to ask.

That was it folks! Thanks a bunch! I´ve installed Java SE 17.0.6, works like a charm!