ModX Parse Error

I have a client that has been using ModX 9.2 for the past 2 years. All of a sudden last week when logging into the manager system the following error occurs
"« MODx Parse Error »
MODx encountered the following error while attempting to parse the requested resource:
« Execution of a query to the database failed - Access denied for user: ’dbo175587115@%’ to database ’db175587115’ » "

This is occuring on /manager/processors/login.processor.php - the bulk of the front-end of the site functions correctly so the config.inc.php information is obviously working correctly but I am not sure what is going on in the manager sectiton fo the site. ANY HELP OR INSIGHT WOULD BE GREATLY APPRECIATED.

It could be running off the cache. I would immediately check with your webhost, and look at the size of the manager actions and system events tables. Your DB could have also been corrupted somehow.