I get this when I go to cache management. (changed the real URL)
The website encountered an error while retrieving http://www.domainname.com/site/admin/index.php?adsess=d5a55e59cbf3663a7e3a8550b77f0c9c&app=core&module=tools§ion=cache&do=cache_overview. It may be down for maintenance or configured incorrectly.
Here are some suggestions:
Reload this webpage later.
HTTP Error 500 (Internal Server Error): An unexpected condition was encountered while the server was attempting to fulfill the request.