That error should be cleaned up, but what it's essentially saying is that the user in question does not have any forums where they have the permission to approve posts.
What you'll want to verify is that in the control panel that your admin group has the ability to approve any posts. Easiest way to do this is to go through Group Management and click on the Forum Link next to the Administrator Group. In there make sure that the "Can Approve Moderated Posts" is set to 1, for all forums.
While you're there, just to be sure, your admin group should have all of the lower permissions, such as delete any posts, delete topics, etc.
Once that's done then the error should clear up and you should get a list of all posts that are in need of approval.
So, for admins to moderate posts, they can either go to that screen, or they can edit an individual post while reading topics and you'll see the Approve Post button there as well.
Last edited by Rick; 02/16/2010 3:06 PM.