ERROR: AssaultCube fatal error: could not create server host

[jamz]

..."ER[R]OR: Assault[C]ube [f]atal er[r]or: could not create server host"...

This error always indicates that you have a server running on port n, then tried to start another on port n+1.

...First server i use ports: 12908
Second server i use ports:12909...
...
ok solved. thanks

As you've discovered, you must run subsequent servers at least two ports away from other servers, which use n+1 for the info port.
I've also modified your thread title, to make it a bit more explicit.