Error when logging in

I tried to log into one of my wordpress sites today, but instead of going to the Dashboard, I got this error:

Fatal error: Call to undefined function get_taxonomies_for_attachments() in /home/fireflycross/fireflycross.pensandtales.com/wp-admin/menu.php on line 67

If I go to the main page, it says I’m logged in fine, but i can’t get access to do anything with it. Is there anything I can do to get this to work?