While in the back end I was to find the page that was throwing the error. I then saw that it was offering a series of options to roll back to earlier versions. When I previewed the most recent option it looked fine. I applied the roll back and that's when every page including the back end began throwing the error you see now. The client does not have ftp access. Any idea of what needs to be done to fix the issue? Thanks.
Server Error in '/' Application.