DaemonUmbra

Please don't Necro old threads, if you have an issue make your own.

iirc that error literally doesn't exist in 1.15.2, so what version are you ACTUALLY using?

What's the full command or batch file for starting the server?

How did you start the server? By running which jar?

Please read the Logs section of my signature below and provide the appropriate log in the appropriate manner.

1.12 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

Mods don't work across Minecraft versions, they aren't universal. There isn't a version of TooManyItems for any modern version, you should be using JustEnoughItems We only provide support for 1.15 and 1.16 at this time

Please read the Logs section of my signature below and provide the appropriate log in the appropriate manner.

1.12 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

If your friend has issues running the installer, treat the cause, not the symptom

Why is Optifine needed?

1.12 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

1.7 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

1.7 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

1.7 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

Forge and Bukkit are not compatible

1.12 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

1.12 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

Why are you even looking for a jar file?

1.12 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

1.7 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

1.12 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

I'm afraid there's not much info here other than something taking too long to save

I've recently learned that this was broken some time ago and I apparently just never noticed because intellij has its own decompiler to cover missing classes

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