java.lang.reflect.invocationtargetexception null

Need some sort of actual crash report. This gives nothing. I suspect you don't have GeckoLib. That's the best guess I can give without any info.

I have the same issue, I guess.
This only happens when launching a server instance, regular MC loads fine.
Here's a crash log.

This is the config issue. Delete the duplicate text in the config file and update to the newest version of C&B and it shouldn't duplicate itself anymore.

You are right, fixed it by deleting the config file and letting it generate a new one during the server launch. Was wondering why sometimes my server wouldn't launch for seemingly no reason. Thanks!

Closing due to inactivity from original author