I tried to change the theme on a blog rippedusa.com/blog and I got this fatal error on all pages. Including the sign in page. I cannot get back in or see any pages. Only this:
Fatal error: Class 'Walker_Nav_Menu' not found in /home/ripped01/public_html/blog/wp-content/themes/graphene/functions.php on line 674
Any ideas on how to fix?