I restarted my server and now this error happens, do someone know why?
Just out of curiosity how did you restart the server… and do you use a world manager? That error typically corresponds to a corrupt world, which means the server was forcably killed while it was doing stuff.
I suppose it could also mean that your hard drive is failing and the data just got corrupt.
The server crashed while someone was world editing, so I restared it
Yep, world’s probably corrupt.
Only way (afaik) to fix it is to restore from a backup.