Here is what shortly popped up in the log before the server crashed:
[11:33:48] [main/INFO]: Loading for game Minecraft 1.14.4
[11:33:48] [main/INFO]: [FabricLoader] Loading 37 mods: [email protected], [email protected]+4ea4772942, [email protected]+4ea4772942, [email protected]+4ea4772942, [email protected]+4ea4772942, [email protected]+build.202, [email protected]+4ea4772942, [email protected]+4ea4772942, [email protected]+4ea4772942, [email protected]+4ea4772942, [email protected]+4ea4772942, [email protected]+4ea4772942, [email protected]+4ea4772942, [email protected]+4ea4772942, [email protected]+de26dc4942, [email protected]+4ea4772942, [email protected]+4ea4772942, [email protected]+4ea4772942, [email protected]+4ea4772942, [email protected]+4ea4772942, [email protected]+4ea4772942, [email protected]+4ea4772942, [email protected]+4ea4772942, [email protected]+4ea4772942, [email protected]+4ea4772942, [email protected]+4ea4772942, [email protected]+4ea4772942, [email protected], [email protected]+4ea4772942, [email protected]+4ea4772942, [email protected]+4ea4772942, [email protected]+1.14, [email protected]+4ea4772942, [email protected]+4ea4772942, [email protected]+4ea4772942, [email protected]+4ea4772942, [email protected]+4ea4772942
[11:33:48] [main/INFO]: SpongePowered MIXIN Subsystem Version=0.8 Source=file:/server/fabric.jar Service=Knot/Fabric Env=SERVER
[11:33:49] [main/WARN]: Error loading class: com/qouteall/immersive_portals/MyCommandClient (java.lang.RuntimeException: Cannot load class com.qouteall.immersive_portals.MyCommandClient in environment type SERVER)
org.spongepowered.asm.mixin.transformer.throwables.MixinPreProcessorException: Attach error for immersive_portals.mixins.json:MixinCommandManager during activity: [Transform -> Method initCommands(ZLorg/spongepowered/asm/mixin/injection/callback/CallbackInfo;)V -> INVOKESTATIC -> com/qouteall/immersive_portals/MyCommandClient::register(Lcom/mojang/brigadier/CommandDispatcher;)V]
at org.spongepowered.asm.mixin.transformer.MixinPreProcessorStandard.attach(MixinPreProcessorStandard.java:300)
at org.spongepowered.asm.mixin.transformer.MixinPreProcessorStandard.createContextFor(MixinPreProcessorStandard.java:264)
at org.spongepowered.asm.mixin.transformer.MixinInfo.createContextFor(MixinInfo.java:1272)
at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.apply(MixinApplicatorStandard.java:287)
at org.spongepowered.asm.mixin.transformer.TargetClassContext.applyMixins(TargetClassContext.java:345)
at org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:570)
at org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:351)
at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClass(MixinTransformer.java:191)
at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClassBytes(MixinTransformer.java:178)
at org.spongepowered.asm.mixin.transformer.FabricMixinTransformerProxy.transformClassBytes(FabricMixinTransformerProxy.java:23)
at net.fabricmc.loader.launch.knot.KnotClassDelegate.getPostMixinClassByteArray(KnotClassDelegate.java:157)
at net.fabricmc.loader.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:143)
at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
at java.lang.Class.privateGetMethodRecursive(Class.java:3048)
at java.lang.Class.getMethod0(Class.java:3018)
at java.lang.Class.getMethod(Class.java:1784)
at net.fabricmc.loader.game.MinecraftGameProvider.launch(MinecraftGameProvider.java:191)
at net.fabricmc.loader.launch.knot.Knot.init(Knot.java:140)
at net.fabricmc.loader.launch.knot.KnotServer.main(KnotServer.java:26)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at net.fabricmc.loader.launch.server.FabricServerLauncher.launch(FabricServerLauncher.java:61)
at net.fabricmc.loader.launch.server.FabricServerLauncher.setup(FabricServerLauncher.java:105)
at net.fabricmc.loader.launch.server.FabricServerLauncher.main(FabricServerLauncher.java:49)
Caused by: java.lang.RuntimeException: java.lang.ClassNotFoundException: com.qouteall.immersive_portals.MyCommandClient
at org.spongepowered.asm.mixin.transformer.MixinPreProcessorStandard.transformMemberReference(MixinPreProcessorStandard.java:768)
at org.spongepowered.asm.mixin.transformer.MixinPreProcessorStandard.transformMethod(MixinPreProcessorStandard.java:754)
at org.spongepowered.asm.mixin.transformer.MixinPreProcessorStandard.transform(MixinPreProcessorStandard.java:720)
at org.spongepowered.asm.mixin.transformer.MixinPreProcessorStandard.attach(MixinPreProcessorStandard.java:294)
... 27 more
Caused by: java.lang.ClassNotFoundException: com.qouteall.immersive_portals.MyCommandClient
... 31 more
Exception in thread "main" java.lang.RuntimeException: Failed to setup Fabric server environment!
at net.fabricmc.loader.launch.server.FabricServerLauncher.main(FabricServerLauncher.java:51)
Caused by: java.lang.RuntimeException: java.lang.RuntimeException: An exception occurred when launching the server!
at net.fabricmc.loader.launch.server.FabricServerLauncher.setup(FabricServerLauncher.java:107)
at net.fabricmc.loader.launch.server.FabricServerLauncher.main(FabricServerLauncher.java:49)
Caused by: java.lang.RuntimeException: An exception occurred when launching the server!
at net.fabricmc.loader.launch.server.FabricServerLauncher.launch(FabricServerLauncher.java:63)
at net.fabricmc.loader.launch.server.FabricServerLauncher.setup(FabricServerLauncher.java:105)
... 1 more
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at net.fabricmc.loader.launch.server.FabricServerLauncher.launch(FabricServerLauncher.java:61)
... 2 more
Caused by: org.spongepowered.asm.mixin.transformer.throwables.MixinTransformerError: An unexpected critical error was encountered
at org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:364)
at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClass(MixinTransformer.java:191)
at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClassBytes(MixinTransformer.java:178)
at org.spongepowered.asm.mixin.transformer.FabricMixinTransformerProxy.transformClassBytes(FabricMixinTransformerProxy.java:23)
at net.fabricmc.loader.launch.knot.KnotClassDelegate.getPostMixinClassByteArray(KnotClassDelegate.java:157)
at net.fabricmc.loader.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:143)
at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
at java.lang.Class.privateGetMethodRecursive(Class.java:3048)
at java.lang.Class.getMethod0(Class.java:3018)
at java.lang.Class.getMethod(Class.java:1784)
at net.fabricmc.loader.game.MinecraftGameProvider.launch(MinecraftGameProvider.java:191)
at net.fabricmc.loader.launch.knot.Knot.init(Knot.java:140)
at net.fabricmc.loader.launch.knot.KnotServer.main(KnotServer.java:26)
... 7 more
Caused by: org.spongepowered.asm.mixin.transformer.throwables.MixinPreProcessorException: Attach error for immersive_portals.mixins.json:MixinCommandManager during activity: [Transform -> Method initCommands(ZLorg/spongepowered/asm/mixin/injection/callback/CallbackInfo;)V -> INVOKESTATIC -> com/qouteall/immersive_portals/MyCommandClient::register(Lcom/mojang/brigadier/CommandDispatcher;)V]
at org.spongepowered.asm.mixin.transformer.MixinPreProcessorStandard.attach(MixinPreProcessorStandard.java:300)
at org.spongepowered.asm.mixin.transformer.MixinPreProcessorStandard.createContextFor(MixinPreProcessorStandard.java:264)
at org.spongepowered.asm.mixin.transformer.MixinInfo.createContextFor(MixinInfo.java:1272)
at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.apply(MixinApplicatorStandard.java:287)
at org.spongepowered.asm.mixin.transformer.TargetClassContext.applyMixins(TargetClassContext.java:345)
at org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:570)
at org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:351)
... 21 more
Caused by: java.lang.RuntimeException: java.lang.ClassNotFoundException: com.qouteall.immersive_portals.MyCommandClient
at org.spongepowered.asm.mixin.transformer.MixinPreProcessorStandard.transformMemberReference(MixinPreProcessorStandard.java:768)
at org.spongepowered.asm.mixin.transformer.MixinPreProcessorStandard.transformMethod(MixinPreProcessorStandard.java:754)
at org.spongepowered.asm.mixin.transformer.MixinPreProcessorStandard.transform(MixinPreProcessorStandard.java:720)
at org.spongepowered.asm.mixin.transformer.MixinPreProcessorStandard.attach(MixinPreProcessorStandard.java:294)
... 27 more
Caused by: java.lang.ClassNotFoundException: com.qouteall.immersive_portals.MyCommandClient
... 31 more