If during the upgrade of the Gallery2 module for Drupal you see an error like this:
all_user_func_array() [function.call-user-func-array]:
First argument is expected to be a valid callback,
'gallery_admin_settings' was given in /home/drupal/includes/form.inc
(and probably an empty or broken Gallery2 module admin. area) then all you need to is go to the theme admin. area and change a setting.
Any setting (I used the 'logo' toggle).
Save it, then change it back and save again.
Odd.
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