The server suddenly crashed and does it non-stop after starting. When it starts, it works for a short while, but you can't connect to it (Conneting to server). After a while there is a crash.

Mod pack version: 1.0.21b

Server crash log

// too long to paste here

I deleted:

• ftbchunks folder from world folder
• region from the entities folder where the mob grinder is located

This seems to have helped, but it's not the best solution. I leave it, because maybe