If you get an error, and only some users are upgraded, try refreshing the page to upgrade remaining users.
Fatal error: Call to a member function getUsername() on a non-object in /home/content/27/3796427/html/gallery/classes/gallery/UserDB.php on line 341
Warning: Unknown: open(/home/content/27/3796427/tmp/sess_squ5lj3e6sncpkjn51oovuhet2, O_RDWR) failed: No such file or directory (2) in Unknown on line 0
Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct () in Unknown on line 0