[02:55:08] [main/INFO]: ModLauncher running: args [--launchTarget, neoforgeserver, --fml.neoForgeVersion, 21.8.54, --fml.fmlVersion, 9.0.18, --fml.mcVersion, 1.21.8, --fml.neoFormVersion, 20250717.133445, nogui] [02:55:08] [main/INFO]: JVM identified as Eclipse Adoptium OpenJDK 64-Bit Server VM 21.0.12.1+1-LTS [02:55:08] [main/INFO]: ModLauncher 9.0 starting: java version 21.0.12.1 by Eclipse Adoptium; OS Linux arch amd64 version 5.15.0-1114-realtime [02:55:08] [main/INFO]: ImmediateWindowProvider not loading because launch target is neoforgeserver [02:55:08] [main/INFO]: SpongePowered MIXIN Subsystem Version=0.8.7 Source=union:/srv/pack/libraries/net/fabricmc/sponge-mixin/0.15.2+mixin.0.8.7/sponge-mixin-0.15.2+mixin.0.8.7.jar%2388!/ Service=ModLauncher Env=SERVER [02:55:09] [main/INFO]: Found mod file "server-1.21.8-20250717.133445-srg.jar" [locator: production server provider +net.neoforged:neoforge:21.8.54:server] [02:55:09] [main/INFO]: Found mod file "neoforge-21.8.54-universal.jar" [locator: PathBasedLocator[name=neoforge, paths=[libraries/net/neoforged/neoforge/21.8.54/neoforge-21.8.54-universal.jar]], reader: mod manifest] [02:55:09] [main/INFO]: Found mod file "constantmusic-neoforge-1.0.6+mc1.21.8.jar" [locator: {mods folder locator at /srv/pack/mods}, reader: mod manifest] [02:55:09] [main/INFO]: Found 2 dependencies adding them to mods collection [02:55:09] [main/INFO]: Found gamelibrary file "mixinextras-neoforge-0.5.3.jar" [parent: neoforge-21.8.54-universal.jar, locator: jarinjar, reader: mod manifest] [02:55:09] [main/INFO]: Found library file "net.neoforged.neoforge-coremods-21.8.54.jar" [parent: neoforge-21.8.54-universal.jar, locator: jarinjar, reader: mod manifest] [02:55:09] [main/INFO]: Mod List: Name Version (Mod Id) Constant Music 1.0.6 (constantmusic) Minecraft 1.21.8 (minecraft) NeoForge 21.8.54 (neoforge) [02:55:09] [main/INFO]: Compatibility level set to JAVA_21 [02:55:09] [main/INFO]: Launching target 'neoforgeserver' with arguments [nogui] [26Sep2026 02:55:10.103] [main/WARN] [mixin/]: Reference map 'constantmusic.refmap.json' for constantmusic.neoforge.mixins.json could not be read. If this is a development environment you can ignore this message [26Sep2026 02:55:10.104] [main/WARN] [mixin/]: Reference map 'constantmusic.refmap.json' for constantmusic.common.mixins.json could not be read. If this is a development environment you can ignore this message [26Sep2026 02:55:11.350] [main/INFO] [MixinExtras|Service/]: Initializing MixinExtras via com.llamalad7.mixinextras.service.MixinExtrasServiceImpl(version=0.5.3). [26Sep2026 02:55:18.857] [modloading-worker-0/ERROR] [net.neoforged.fml.javafmlmod.FMLModContainer/LOADING]: Failed to create mod instance. ModID: constantmusic, class com.odinokland.constantmusic.neoforge.ConstantMusicNeoForge java.lang.NoClassDefFoundError: net/minecraft/client/OptionInstance$ValueSet at TRANSFORMER/constantmusic@1.0.6/com.odinokland.constantmusic.neoforge.ConstantMusicNeoForge.(ConstantMusicNeoForge.java:32) ~[constantmusic-neoforge-1.0.6+mc1.21.8.jar%23146!/:?] at java.base/jdk.internal.reflect.DirectConstructorHandleAccessor.newInstance(DirectConstructorHandleAccessor.java:62) ~[?:?] at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:502) ~[?:?] at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:486) ~[?:?] at MC-BOOTSTRAP/fml_loader@9.0.18/net.neoforged.fml.javafmlmod.FMLModContainer.constructMod(FMLModContainer.java:118) ~[loader-9.0.18.jar%2372!/:9.0] at MC-BOOTSTRAP/fml_loader@9.0.18/net.neoforged.fml.ModLoader.lambda$constructMods$3(ModLoader.java:151) ~[loader-9.0.18.jar%2372!/:9.0] at MC-BOOTSTRAP/fml_loader@9.0.18/net.neoforged.fml.ModLoader.lambda$dispatchParallelTask$7(ModLoader.java:229) ~[loader-9.0.18.jar%2372!/:9.0] at java.base/java.util.concurrent.CompletableFuture.uniHandle(CompletableFuture.java:934) [?:?] at java.base/java.util.concurrent.CompletableFuture$UniHandle.tryFire(CompletableFuture.java:911) [?:?] at java.base/java.util.concurrent.CompletableFuture$Completion.exec(CompletableFuture.java:483) [?:?] at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:387) [?:?] at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1312) [?:?] at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1843) [?:?] at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1808) [?:?] at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:188) [?:?] Caused by: java.lang.ClassNotFoundException: net.minecraft.client.OptionInstance$ValueSet at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641) ~[?:?] at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526) ~[?:?] at cpw.mods.securejarhandler/cpw.mods.cl.ModuleClassLoader.loadClass(ModuleClassLoader.java:228) ~[securejarhandler-9.0.18.jar:?] at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526) ~[?:?] at cpw.mods.securejarhandler/cpw.mods.cl.ModuleClassLoader.loadClass(ModuleClassLoader.java:228) ~[securejarhandler-9.0.18.jar:?] at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526) ~[?:?] ... 15 more [26Sep2026 02:55:18.892] [modloading-worker-0/INFO] [net.neoforged.neoforge.common.NeoForgeMod/NEOFORGE-MOD]: NeoForge mod loading, version 21.8.54, for MC 1.21.8 [26Sep2026 02:55:19.027] [main/FATAL] [net.neoforged.fml.ModLoader/LOADING]: Failed to wait for future Mod Construction, 1 errors found [26Sep2026 02:55:19.172] [main/ERROR] [net.minecraft.CrashReport/]: Negative index in crash report handler (0/25) [26Sep2026 02:55:19.182] [main/FATAL] [net.neoforged.neoforge.common.NeoForgeMod/]: Preparing crash report with UUID 53f2d59b-38a6-431f-ad3f-9ef61b294342 [26Sep2026 02:55:19.183] [main/FATAL] [net.neoforged.neoforge.server.loading.ServerModLoader/]: Crash report saved to ./crash-reports/crash-2026-09-26_02.55.19-fml.txt [26Sep2026 02:55:19.183] [main/FATAL] [net.neoforged.neoforge.common.NeoForgeMod/]: Preparing crash report with UUID 39d850f3-c377-4506-9ed8-5840e7383da6 [26Sep2026 02:55:19.186] [main/ERROR] [net.minecraft.server.Main/FATAL]: Failed to start the minecraft server net.neoforged.fml.ModLoadingException: Loading errors encountered: - Constant Music (constantmusic) has failed to load correctly java.lang.NoClassDefFoundError: net/minecraft/client/OptionInstance$ValueSet at MC-BOOTSTRAP/fml_loader@9.0.18/net.neoforged.fml.ModLoader.waitForFuture(ModLoader.java:279) ~[loader-9.0.18.jar%2372!/:9.0] at MC-BOOTSTRAP/fml_loader@9.0.18/net.neoforged.fml.ModLoader.dispatchParallelTask(ModLoader.java:242) ~[loader-9.0.18.jar%2372!/:9.0] at MC-BOOTSTRAP/fml_loader@9.0.18/net.neoforged.fml.ModLoader.constructMods(ModLoader.java:150) ~[loader-9.0.18.jar%2372!/:9.0] at MC-BOOTSTRAP/fml_loader@9.0.18/net.neoforged.fml.ModLoader.gatherAndInitializeMods(ModLoader.java:140) ~[loader-9.0.18.jar%2372!/:9.0] at TRANSFORMER/neoforge@21.8.54/net.neoforged.neoforge.internal.CommonModLoader.begin(CommonModLoader.java:49) ~[neoforge-21.8.54-universal.jar%23145!/:?] at TRANSFORMER/neoforge@21.8.54/net.neoforged.neoforge.server.loading.ServerModLoader.load(ServerModLoader.java:29) ~[neoforge-21.8.54-universal.jar%23145!/:?] at TRANSFORMER/minecraft@1.21.8/net.minecraft.server.Main.main(Main.java:120) ~[server-1.21.8-20250717.133445-srg.jar%23144!/:?] at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103) ~[?:?] at java.base/java.lang.reflect.Method.invoke(Method.java:580) ~[?:?] at MC-BOOTSTRAP/fml_loader@9.0.18/net.neoforged.fml.loading.targets.CommonLaunchHandler.runTarget(CommonLaunchHandler.java:132) ~[loader-9.0.18.jar%2372!/:9.0] at MC-BOOTSTRAP/fml_loader@9.0.18/net.neoforged.fml.loading.targets.CommonLaunchHandler.serverService(CommonLaunchHandler.java:124) ~[loader-9.0.18.jar%2372!/:9.0] at MC-BOOTSTRAP/fml_loader@9.0.18/net.neoforged.fml.loading.targets.NeoForgeServerLaunchHandler.runService(NeoForgeServerLaunchHandler.java:41) ~[loader-9.0.18.jar%2372!/:9.0] at MC-BOOTSTRAP/fml_loader@9.0.18/net.neoforged.fml.loading.targets.CommonLaunchHandler.lambda$launchService$4(CommonLaunchHandler.java:114) ~[loader-9.0.18.jar%2372!/:9.0] at MC-BOOTSTRAP/fml_loader@9.0.18/cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:25) [loader-9.0.18.jar%2372!/:9.0] at MC-BOOTSTRAP/fml_loader@9.0.18/cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:55) [loader-9.0.18.jar%2372!/:9.0] at MC-BOOTSTRAP/fml_loader@9.0.18/cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:73) [loader-9.0.18.jar%2372!/:9.0] at MC-BOOTSTRAP/fml_loader@9.0.18/cpw.mods.modlauncher.Launcher.run(Launcher.java:104) [loader-9.0.18.jar%2372!/:9.0] at MC-BOOTSTRAP/fml_loader@9.0.18/cpw.mods.modlauncher.Launcher.main(Launcher.java:75) [loader-9.0.18.jar%2372!/:9.0] at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103) ~[?:?] at java.base/java.lang.reflect.Method.invoke(Method.java:580) ~[?:?] at cpw.mods.bootstraplauncher/cpw.mods.bootstraplauncher.BootstrapLauncher.run(BootstrapLauncher.java:203) [bootstraplauncher-9.0.18.jar:?] at cpw.mods.bootstraplauncher/cpw.mods.bootstraplauncher.BootstrapLauncher.main(BootstrapLauncher.java:62) [bootstraplauncher-9.0.18.jar:?] at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103) ~[?:?] at java.base/java.lang.reflect.Method.invoke(Method.java:580) ~[?:?] at net.neoforged.serverstarterjar.Main.mainLaunch(Main.java:306) [server.jar:0.1.35] at net.neoforged.serverstarterjar.Main.main(Main.java:76) [server.jar:0.1.35] at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103) ~[?:?] at java.base/java.lang.reflect.Method.invoke(Method.java:580) ~[?:?] at net.neoforged.serverstarterjar.Main8.main(Main8.java:19) [server.jar:0.1.35]