I have not changed a thing to this site and it was working fine last time I saw it (yesterday). Today when I try to login to the Admin, (I'm not actually getting the login screen) I get this error:

Fatal error: Cannot redeclare class base in /home/XXXXXX/public_html/store/includes/classes/class.base.php on line 17

I've done some searching around the forum and see that this error happens to others from time to time and it's blamed on several contributions but I just don't know what to do! The catalog part seems to be working alright.

Please help!
Nancy