My modded server keeps crashing

Sadly, your server doesn't say which mod causes this.

You will have to follow these steps:

1. Remove a mod from your server
2. Remove all other mods that require that mod
3. Try to start your server and see if the problem is solved
4. If the problem isn't solved, continue at step 1

Once the issue is solved, you can try to add all mods except the last one you removed back.