in crash-report an error pops up when loading
there is no more information

Not much to go on but i'll test.

https://gist.github.com/P3rf3ctXZer0/df6c392ed04c5724f3604507ab4b0891

Here this might help @gottsch crash is only triggered by making a new world on dedicated server.

I am a beta tester through and through. It makes no sense for me to not use the latest version. I am sorry if you didn't intend for the mod to be used in this way. Good luck with your mod.

This looks like a case of mismatched forge versions. I used forge 1.12.2-14.23.1.2555 to compile and you're using 1.12.2-14.23.2.2632. It happens that method names in the code change between versions causing errors. Try using the 2555 version and see if it still happens.

As well, in the future, I would suggest not getting the Latest version of forge, but download the Recommended.