I tried fixing it myself for quiet a while now and I have no clue what to do at all.
I'm linking the crash report and a copy of the console.
The error occurs when starting the server. And the Server closes right after loading all dimensions.
I've tried deleting a few mods/configs and reloading them or and updating them. What got me the server running
until someone joined ( and then the crash happened all over again) was deleting the forcechunks.dat,
though l dont think the crash is occuring becausue of chunkloaders.
Both crash reports should show the same error.
CrashLog1
https://pastebin.com/index/6nmtDxPk
CrashLog2
https://pastebin.com/fYubwxmp
ServerConsole
https://pastebin.com/GDx79RT9
If anyone has the time to look over it, l would be more than glad!
Ups, forgot.
Here the latest.log if it helps:
https://pastebin.com/8Jz1iNsT
The in my opinion only important part of the lastest.log is found in the copy of the server console in one of the upper links.
If u need more information to help me just message me.