unused error message internal error

AOL mail will not load with following message: unused The server encountered an internal error or misconfiguration and was unable to complete your request. Please contact the server administrator, admin@aol.net and inform them of the time the error occurred, and anything you might have done that may have caused the error. More information about this error may be available in the server error log. Additionally, a 418 unused error was encountered while trying to use an ErrorDocument to handle the request.