I'm currently working on a WordPress site and whenever in the admin I go the Appearance > Menus page I get the following error:
ErrorException: Runtime Notice: Declaration of Walker_Nav_Menu_Edit::start_lvl() should be compatible with that of Walker_Nav_Menu::start_lvl() in wp-admin/includes/nav-menu.php line 203
It seems like some sort of PHP compatibility issue. I'm running PHP 5.3.10 on my local dev machine.
What would be the best way to remedy this problem?