settings

There are several major modules and few dosens of additional tools on internationalisation. I find it quite confusing to figure out, what particular combination of modules and settings will lead to the expected behaviour. So I'm addressing other group members with this request to help me.

When I try to gone to "phpBBforum settings" in Drupal, I get this warning: call_user_func_array(): First argument is expected to be a valid callback, 'phpbbforum_admin_settings' was given in /hsphere/local/home/drupal/ubercart.drupal.no/includes/form.inc on line 218.

I have tried to followed this guide "\phpbbforum-5.x-1.x-dev\phpbbforum\contrib\phpbbdrupal\install.xml" Waht to do now?
I'm using Drupal 5.7 and phpBB3