Configuration with Minecraft - how do i install create mod

Technical Support
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1

System Information

Field Value
Operating System Linux - Debian GNU/Linux 13 on x86_64
Product AMP ‘Proteus’ v2.8.0.4 (Mainline)
Virtualization Docker
Application Minecraft
Module MinecraftModule
Running in Container Yes
Current State Failed

Problem Description

Issue

as per the title. tried to create a create mod server, can not work out what neo forge to run. i have the mods on my pc to. just keeps throwing erros no matter what I try.

Reproduction Steps

  • created server
  • installed neo forge
  • server wont start
2

What’s the error? You might have the wrong version of Java selected. Many possibilities but can’t tell without the error log.

3

Hi, sorry new to all this. This is the latest log i found

[04Sep2026 06:49:25.136] [main/INFO] [cpw.mods.modlauncher.Launcher/MODLAUNCHER]: ModLauncher running: args [–launchTarget, forgeserver, --fml.neoForgeVersion, 21.1.249, --fml.fmlVersion, 4.0.44, --fml.mcVersion, 1.21.1, --fml.neoFormVersion, 20240808.144430]
[04Sep2026 06:49:25.139] [main/INFO] [cpw.mods.modlauncher.Launcher/MODLAUNCHER]: JVM identified as Eclipse Adoptium OpenJDK 64-Bit Server VM 25.0.4.1+1-LTS
[04Sep2026 06:49:25.142] [main/INFO] [cpw.mods.modlauncher.Launcher/MODLAUNCHER]: ModLauncher 11.0.5+main.901c6ea8 starting: java version 25.0.4.1 by Eclipse Adoptium; OS Linux arch amd64 version 6.12.95+deb13-cloud-amd64
[04Sep2026 06:49:25.229] [main/WARN] [net.neoforged.fml.loading.FMLConfig/CORE]: Configuration file /AMP/Minecraft/config/fml.toml is not correct. Correcting
[04Sep2026 06:49:25.271] [main/INFO] [net.neoforged.fml.loading.ImmediateWindowHandler/]: ImmediateWindowProvider not loading because launch target is forgeserver
[04Sep2026 06:49:25.324] [main/INFO] [mixin/]: SpongePowered MIXIN Subsystem Version=0.8.7 Source=union:/AMP/Minecraft/libraries/net/fabricmc/sponge-mixin/0.15.2+mixin.0.8.7/sponge-mixin-0.15.2+mixin.0.8.7.jar%2373!/ Service=ModLauncher Env=SERVER
[04Sep2026 06:49:25.336] [main/WARN] [net.neoforged.fml.loading.FMLConfig/CORE]: Configuration file /AMP/Minecraft/config/fml.toml is not correct. Correcting
[04Sep2026 06:49:25.732] [main/INFO] [net.neoforged.fml.loading.moddiscovery.ModDiscoverer/SCAN]: Found mod file “server-1.21.1-20240808.144430-srg.jar” [locator: production server provider +net.neoforged:neoforge:21.1.249:server]
[04Sep2026 06:49:25.761] [main/INFO] [net.neoforged.fml.loading.moddiscovery.ModDiscoverer/SCAN]: Found mod file “neoforge-21.1.249-universal.jar” [locator: PathBasedLocator[name=neoforge, paths=[libraries/net/neoforged/neoforge/21.1.249/neoforge-21.1.249-universal.jar]], reader: mod manifest]
[04Sep2026 06:49:25.795] [main/INFO] [net.neoforged.fml.loading.moddiscovery.ModDiscoverer/SCAN]: Found mod file “create-1.21.1-6.0.10.jar” [locator: {mods folder locator at /AMP/Minecraft/mods}, reader: mod manifest]
[04Sep2026 06:49:25.802] [main/INFO] [net.neoforged.fml.loading.moddiscovery.ModDiscoverer/SCAN]: Found mod file “jei-1.21.1-neoforge-19.51.0.418.jar” [locator: {mods folder locator at /AMP/Minecraft/mods}, reader: mod manifest]
[04Sep2026 06:49:26.036] [main/INFO] [net.neoforged.fml.loading.moddiscovery.locators.JarInJarDependencyLocator/]: Found 5 dependencies adding them to mods collection
[04Sep2026 06:49:26.039] [main/INFO] [net.neoforged.fml.loading.moddiscovery.ModDiscoverer/SCAN]: Found gamelibrary file “mixinextras-neoforge-0.5.3.jar” [parent: neoforge-21.1.249-universal.jar, locator: jarinjar, reader: mod manifest]
[04Sep2026 06:49:26.039] [main/INFO] [net.neoforged.fml.loading.moddiscovery.ModDiscoverer/SCAN]: Found gamelibrary file “Registrate-MC1.21-1.3.0+67.jar” [parent: create-1.21.1-6.0.10.jar, locator: jarinjar, reader: mod manifest]
[04Sep2026 06:49:26.039] [main/INFO] [net.neoforged.fml.loading.moddiscovery.ModDiscoverer/SCAN]: Found mod file “flywheel-neoforge-1.21.1-1.0.6.jar” [parent: create-1.21.1-6.0.10.jar, locator: jarinjar, reader: mod manifest]
[04Sep2026 06:49:26.040] [main/INFO] [net.neoforged.fml.loading.moddiscovery.ModDiscoverer/SCAN]: Found mod file “ponder-neoforge-1.0.82+mc1.21.1.jar” [parent: create-1.21.1-6.0.10.jar, locator: jarinjar, reader: mod manifest]
[04Sep2026 06:49:26.040] [main/INFO] [net.neoforged.fml.loading.moddiscovery.ModDiscoverer/SCAN]: Found library file “net.neoforged.neoforge-coremods-21.1.249.jar” [parent: neoforge-21.1.249-universal.jar, locator: jarinjar, reader: mod manifest]
[04Sep2026 06:49:26.042] [main/INFO] [net.neoforged.fml.loading.moddiscovery.ModDiscoverer/]:
Mod List:
Name Version (Mod Id)

	Create 6.0.10 (create)
	Flywheel 1.0.6 (flywheel)
	Just Enough Items 19.51.0.418 (jei)
	Minecraft 1.21.1 (minecraft)
	NeoForge 21.1.249 (neoforge)
	Ponder 1.0.82+mc1.21.1 (ponder)

[04Sep2026 06:49:26.703] [main/INFO] [mixin/]: Compatibility level set to JAVA_21
[04Sep2026 06:49:26.749] [main/INFO] [cpw.mods.modlauncher.LaunchServiceHandler/MODLAUNCHER]: Launching target ‘forgeserver’ with arguments
[04Sep2026 06:49:26.866] [main/WARN] [mixin/]: Reference map ‘ponder.refmap.json’ for ponder-common.mixins.json could not be read. If this is a development environment you can ignore this message
[04Sep2026 06:49:27.524] [main/WARN] [mixin/]: Error loading class: org/jetbrains/annotations/ApiStatus$ScheduledForRemoval (java.lang.ClassNotFoundException: org.jetbrains.annotations.ApiStatus$ScheduledForRemoval)
[04Sep2026 06:49:27.934] [main/INFO] [MixinExtras|Service/]: Initializing MixinExtras via com.llamalad7.mixinextras.service.MixinExtrasServiceImpl(version=0.5.3).
[04Sep2026 06:49:35.396] [modloading-worker-0/INFO] [net.neoforged.neoforge.common.NeoForgeMod/NEOFORGE-MOD]: NeoForge mod loading, version 21.1.249, for MC 1.21.1
[04Sep2026 06:49:35.414] [modloading-worker-0/INFO] [com.simibubi.create.Create/]: Create 6.0.10 initializing! Commit hash: ac0c444d9828da3453ae8cc65338e8de063286fb
[04Sep2026 06:49:39.176] [NeoForge Version Check/INFO] [net.neoforged.fml.VersionChecker/]: [create] Starting version check at
[04Sep2026 06:49:39.395] [main/WARN] [net.minecraft.server.packs.VanillaPackResourcesBuilder/]: Assets URL ‘union:/AMP/Minecraft/libraries/net/minecraft/server/1.21.1-20240808.144430/server-1.21.1-20240808.144430-srg.jar%23119!/assets/.mcassetsroot’ uses unexpected schema
[04Sep2026 06:49:39.395] [main/WARN] [net.minecraft.server.packs.VanillaPackResourcesBuilder/]: Assets URL ‘union:/AMP/Minecraft/libraries/net/minecraft/server/1.21.1-20240808.144430/server-1.21.1-20240808.144430-srg.jar%23119!/data/.mcassetsroot’ uses unexpected schema
[04Sep2026 06:49:39.488] [main/INFO] [com.simibubi.create.Create/]: Created 157 recipes which will be injected into the game
[04Sep2026 06:49:39.495] [main/INFO] [com.simibubi.create.Create/]: Created 0 tags which will be injected into the game
[04Sep2026 06:49:39.581] [main/INFO] [net.minecraft.server.MinecraftServer/]: Found new data pack create:dynamic_data, loading it automatically
[04Sep2026 06:49:39.992] [NeoForge Version Check/INFO] [net.neoforged.fml.VersionChecker/]: [create] Found status: OUTDATED Current: 6.0.10 Target: 6.0.10+mc1.21.1
[04Sep2026 06:49:40.526] [main/WARN] [net.minecraft.server.Main/]: Failed to load datapacks, can’t proceed with server load. You can either fix your datapacks or reset to vanilla with --safeMode
java.util.concurrent.ExecutionException: java.lang.IllegalStateException: No key dimensions in MapLike[{}]; No key seed in MapLike[{}]
at java.base/java.util.concurrent.CompletableFuture.wrapInExecutionException(CompletableFuture.java:345) ~[?:?]
at java.base/java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:440) ~[?:?]
at java.base/java.util.concurrent.CompletableFuture.get(CompletableFuture.java:2094) ~[?:?]
at TRANSFORMER/minecraft@1.21.1/net.minecraft.server.Main.main(Main.java:258) [server-1.21.1-20240808.144430-srg.jar%23119!/:?]
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104) ~[?:?]
at java.base/java.lang.reflect.Method.invoke(Method.java:565) ~[?:?]
at MC-BOOTSTRAP/fml_loader@4.0.44/net.neoforged.fml.loading.targets.CommonLaunchHandler.runTarget(CommonLaunchHandler.java:136) [loader-4.0.44.jar%2359!/:4.0]
at MC-BOOTSTRAP/fml_loader@4.0.44/net.neoforged.fml.loading.targets.CommonLaunchHandler.serverService(CommonLaunchHandler.java:128) [loader-4.0.44.jar%2359!/:4.0]
at MC-BOOTSTRAP/fml_loader@4.0.44/net.neoforged.fml.loading.targets.CommonServerLaunchHandler.runService(CommonServerLaunchHandler.java:32) [loader-4.0.44.jar%2359!/:4.0]
at MC-BOOTSTRAP/fml_loader@4.0.44/net.neoforged.fml.loading.targets.CommonLaunchHandler.lambda$launchService$4(CommonLaunchHandler.java:118) [loader-4.0.44.jar%2359!/:4.0]
at MC-BOOTSTRAP/cpw.mods.modlauncher@11.0.5/cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:30) [modlauncher-11.0.5.jar%2364!/:?]
at MC-BOOTSTRAP/cpw.mods.modlauncher@11.0.5/cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:53) [modlauncher-11.0.5.jar%2364!/:?]
at MC-BOOTSTRAP/cpw.mods.modlauncher@11.0.5/cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:71) [modlauncher-11.0.5.jar%2364!/:?]
at MC-BOOTSTRAP/cpw.mods.modlauncher@11.0.5/cpw.mods.modlauncher.Launcher.run(Launcher.java:103) [modlauncher-11.0.5.jar%2364!/:?]
at MC-BOOTSTRAP/cpw.mods.modlauncher@11.0.5/cpw.mods.modlauncher.Launcher.main(Launcher.java:74) [modlauncher-11.0.5.jar%2364!/:?]
at MC-BOOTSTRAP/cpw.mods.modlauncher@11.0.5/cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:26) [modlauncher-11.0.5.jar%2364!/:?]
at MC-BOOTSTRAP/cpw.mods.modlauncher@11.0.5/cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:23) [modlauncher-11.0.5.jar%2364!/:?]
at cpw.mods.bootstraplauncher@2.0.2/cpw.mods.bootstraplauncher.BootstrapLauncher.run(BootstrapLauncher.java:210) [bootstraplauncher-2.0.2.jar:?]
at cpw.mods.bootstraplauncher@2.0.2/cpw.mods.bootstraplauncher.BootstrapLauncher.main(BootstrapLauncher.java:69) [bootstraplauncher-2.0.2.jar:?]
Caused by: java.lang.IllegalStateException: No key dimensions in MapLike[{}]; No key seed in MapLike[{}]
at MC-BOOTSTRAP/datafixerupper@8.0.16/com.mojang.serialization.DataResult$Error.getOrThrow(DataResult.java:287) ~[datafixerupper-8.0.16.jar%23100!/:?]
at MC-BOOTSTRAP/datafixerupper@8.0.16/com.mojang.serialization.DataResult.getOrThrow(DataResult.java:81) ~[datafixerupper-8.0.16.jar%23100!/:?]
at TRANSFORMER/minecraft@1.21.1/net.minecraft.world.level.storage.LevelStorageSource.getLevelDataAndDimensions(LevelStorageSource.java:140) ~[server-1.21.1-20240808.144430-srg.jar%23119!/:?]
at TRANSFORMER/minecraft@1.21.1/net.minecraft.server.Main.lambda$main$2(Main.java:210) ~[server-1.21.1-20240808.144430-srg.jar%23119!/:?]
at TRANSFORMER/minecraft@1.21.1/net.minecraft.server.WorldLoader.load(WorldLoader.java:43) ~[server-1.21.1-20240808.144430-srg.jar%23119!/:?]
at TRANSFORMER/minecraft@1.21.1/net.minecraft.server.Main.lambda$main$3(Main.java:205) ~[server-1.21.1-20240808.144430-srg.jar%23119!/:?]
at TRANSFORMER/minecraft@1.21.1/net.minecraft.Util.blockUntilDone(Util.java:866) ~[server-1.21.1-20240808.144430-srg.jar%23119!/:?]
at TRANSFORMER/minecraft@1.21.1/net.minecraft.Util.blockUntilDone(Util.java:861) ~[server-1.21.1-20240808.144430-srg.jar%23119!/:?]
at TRANSFORMER/minecraft@1.21.1/net.minecraft.server.Main.main(Main.java:204) ~[server-1.21.1-20240808.144430-srg.jar%23119!/:?]
… 15 more

4

It looks like you may be trying to load a vanilla world with mods. Delete the world folder in the AMP File Manager and try again.