[galaxy-user] "Server Error"on Main when viewing or downloading FastQC results

I've run FastQC successfully on several different files, but I can not download them or view them. In either. case I receive the following message in my browser (Firefox): Server Error An error occurred. See the error logs for more information. (Turn debug on to display exception reports here) If I go into a history and try to view other FastQC reports that I have viewed before, I get the same error. So I don't think this is a data format or tools issue. I searched the archives, and the server error message has been reported before, and was fixed but no details were given. Thanks for your help. Wade