look at the print screen: img291.imageshack.us/img291/5354/coolzac.jpg... and look at the bottom at the instant messanger! its says server error!

You must log out. Then log in and try again. It must help :)

This occasionally happens, correct me if im wrong, through no fault of your own. As szakalas said above, you can just log out and log in again, or wait a minute, and refresh your page.

Just have to refresh :-)