There was a problem connecting to the server...

When I open iWeb, or try to set up a screen saver to display a directory of my photographs, I get the following message which keeps popping up until I close the apps

This MacBook no longer exists

When I look at My connect to server window there is an entry for afp://192.168.1.68 which gives me the above error when I try to connect to it. I do not seem to be able to get rid of this entry as it is listed as a favourite and when I clear my connection it is stil there when I re open the connect to server window.

Mac OSX Mountain Lion v 10.8.2