fix phpbb error

I get the following message when I access the forum home. When I try the link again it goes away: ******* Failed obtaining forum access control lists DEBUG MODE SQL Error : 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'AND ug.user_pending = 0 AND a.group_id = ug.group_id' at line 4 SELECT a.forum_id, a.auth_view, a.auth_mod FROM phpbb_auth_access a, phpbb_user_group ug WHERE ug.user_id = AND ug.user_pending = 0 AND a.group_id = ug.group_id Line : 163 File : [login to view URL] ******** The error also occurs on another forum so the job would be for fixing the same error on the both forums. The error has already been reported to be by many of the forum members. No one has been able to fix this for me. If you can solve this for me quickly for the cheapest price we can do some long term business together.