Server stoped with Critical "Could not start file manager 258 no network port available"

Server Crashed server version 3.9.1

So first of all, your server version is really old and should be updated.
Secondly, the error says it right there: some other application is already listening on that port. You need to figure out what it is and stop it / fix the conflict in general.


I just installed a new one, hope it won’t happen again

It will, when all ports are in use already or no or wrong IP was used.