How can this be fix regarding a error for Upgrade Network?


When upgrading a the network, I get a error for one of the subsites (not the others)...

Upgrade Network
Warning! Problem updating Your server may not be able to connect to sites running on it. Error message: Coundn't resolve host ''. fact, that one can not be found...

Is it because of the "-" in the subsite name or something else because the other subsites update just fine.