Problem: You receive a message similar to this when viewing your site:

Solution: The error is occurring because ExpressionEngine is unable to delete one of your cache files from the server.  In the majority of cases, this means that you need to make sure that the directories have the correct permissions.  Check to ensure that the system/cache/ directory and all of its subdirectories have permissions of 777.

In rare cases, this error has been reported and caused by the unlink() PHP function being disabled.  ExpressionEngine requires that function in order to delete files.