NOW I've done it – Fatal Error

Long story short – while trying to create an alias for a Parent Page, I crashed my site – tyrooc.org – see the error message below.

I’ve read about the fix – download FileZilla and FTP in, revert back to older files (I’ve never done this but I think I could figure it out.)

Problem: I didn’t create the site, it was a custom build – an IT undergrad’s senior thesis. I don’t know where any of the original files are at, where the database is located…

Is there a way of finding it w/out tracking down this kid?

Thanks!

Travis

The Error ——————————————
Fatal error: Call to a member function add_rewrite_tag() on a non-object in /home/tyroocorg/tyrooc.org/wp-includes/taxonomy.php on line 289