Hello,
Are you seeing this error message when doing particular tasks, or does it appear whenever you start XMetaL? If there is a particular set of steps for reproducing the issue, that would be helpful in troubleshooting.
Most likely, though, the problem is that a critical file has become corrupted or has gone missing, and the procedure for uninstalling and reinstalling XMetaL would be worth trying:
http://forums.xmetal.com/index.php/topic,67.0.html .
Su-Laine
