500 error

fairfax.ls.net was in a mess so I tried the farm root d7.ls.net. It wouldn't load with a "500" server error.
Apache error logs are the place to start.
[Fri Jun 14 05:35:58 2013] [error] [client] PHP Fatal error:  Class 'MollomDrupal' not found in /home/lsnet/public_html/d7.ls.net/sites/all/modules/mollom/mollom.module on line 2150
I remember a Mollum update from not too long ago but Google suggest corrupted cache.
root@helen:/home/lsnet/public_html/d7.ls.net# drush cc
That fixed this problem.