version 2.4 Venetian, on a go daddy server windows xp

Just when I thought I had iy under control...
when I try to log in with the admin user and provided password I get this;

Fatal error: Call to a member function on a non-object in /home/content/s/h/a/shawnmahaffey/html/inc/_main.inc.php on line 447

...I need a drink.