Tried to make an aternos server using several mods and it crashed.

[Haichiroku]

I added all the necessary files that I used for the mods into the server and this happened. Solo Minecraft runs fine and I assumed that the only requirements I need to use for the mods would be the same for the server.

java.lang.RuntimeException: Could not execute entrypoint stage 'main' due to errors, provided by 'compacttnt'!
at net.fabricmc.loader.entrypoint.minecraft.hooks.EntrypointUtils.invoke0(EntrypointUtils.java:50) ~[fabric.jar:?]
at net.fabricmc.loader.entrypoint.minecraft.hooks.EntrypointUtils.invoke(EntrypointUtils.java:33) ~[fabric.jar:?]
at net.fabricmc.loader.entrypoint.minecraft.hooks.EntrypointServer.start(EntrypointServer.java:33) ~[fabric.jar:?]
at net.minecraft.server.Main.main(Main.java:92) [intermediary-server.jar:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_292]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_292]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_292]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_292]
at net.fabricmc.loader.game.MinecraftGameProvider.launch(MinecraftGameProvider.java:234) [fabric.jar:?]
at net.fabricmc.loader.launch.knot.Knot.launch(Knot.java:153) [fabric.jar:?]
at net.fabricmc.loader.launch.knot.KnotServer.main(KnotServer.java:28) [fabric.jar:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_292]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_292]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_292]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_292]
at net.fabricmc.loader.launch.server.FabricServerLauncher.launch(FabricServerLauncher.java:68) [fabric.jar:?]
at net.fabricmc.loader.launch.server.FabricServerLauncher.setup(FabricServerLauncher.java:114) [fabric.jar:?]
at net.fabricmc.loader.launch.server.FabricServerLauncher.main(FabricServerLauncher.java:56) [fabric.jar:?]
Caused by: java.lang.NoClassDefFoundError: net/minecraft/class_3879
at net.moddercoder.compacttnt.creatures.CompactTNTCreatures.register(CompactTNTCreatures.java:49) ~[Compact-TNT-Mod-1.6.jar:?]
at net.moddercoder.compacttnt.CompactTNT.onInitialize(CompactTNT.java:16) ~[Compact-TNT-Mod-1.6.jar:?]
at net.fabricmc.loader.entrypoint.minecraft.hooks.EntrypointUtils.invoke0(EntrypointUtils.java:47) ~[fabric.jar:?]
... 17 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.class_3879
at java.net.URLClassLoader.findClass(URLClassLoader.java:382) ~[?:1.8.0_292]
at java.lang.ClassLoader.loadClass(ClassLoader.java:418) ~[?:1.8.0_292]
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:352) ~[?:1.8.0_292]
at java.lang.ClassLoader.loadClass(ClassLoader.java:351) ~[?:1.8.0_292]
at net.fabricmc.loader.launch.server.InjectingURLClassLoader.loadClass(InjectingURLClassLoader.java:57) ~[fabric.jar:?]
at java.lang.ClassLoader.loadClass(ClassLoader.java:351) ~[?:1.8.0_292]
at net.fabricmc.loader.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:175) ~[fabric.jar:?]
at java.lang.ClassLoader.loadClass(ClassLoader.java:351) ~[?:1.8.0_292]
at net.moddercoder.compacttnt.creatures.CompactTNTCreatures.register(CompactTNTCreatures.java:49) ~[Compact-TNT-Mod-1.6.jar:?]
at net.moddercoder.compacttnt.CompactTNT.onInitialize(CompactTNT.java:16) ~[Compact-TNT-Mod-1.6.jar:?]
at net.fabricmc.loader.entrypoint.minecraft.hooks.EntrypointUtils.invoke0(EntrypointUtils.java:47) ~[fabric.jar:?]
... 17 more

[warjort]

This is a bug in CompactTNT.

During its initialization (on the server) it is trying to load net.minecraft.class_3879 which is net/minecraft/client/model/Model
As its yarn name suggests, that class is only available on the client and not the dedicated server.

The mod needs to be fixed to only do client specific setup in an onInitializeClient mod initializer.

[warjort]

This appears to be a known issue:
https://gitlab.com/Volfenstein/compact-tnt/-/issues/2