If you have moved mosLM between servers and your path to your Joomla installation has changed then you need to update several paths in mosLM's database tables as these paths are hardcoded.

Use phpMyAdmin to access your Joomla database, and then look for either a mos_preferences or mos_lmpreferences (depending on mosLM version)

In that table there are several fields that you will see have your old absolute path.  You need to change those.

Also make sure that you look at page one and page two as phpMyAdmin splits the table into two pages.

then CLOSE ALL BROWSER WINDOWS to expire the php session and then restart your browser.