error 503 service temporarily unavailable

and 500 internal server error.

what are these errors.

These were the errors I encountered having simultaneous members' invitations to be their friend.

I'd checked my server for bandwidth, but it's not. Is it the jcow's script has the problem? give me enlightenment.

No it is not jcow .... it is php/apache misconfiguration from your server provider ... ask them to solve this problem!!!

ooh. ok, thanks so much adil.
is it really the hosting server, even I'm using the fantastico?