Posts will not open
 

On my vBulletin forum I was getting a database error* The web host fixed that problem. No new changes have been made to the forum in the past few months but its still is not working and the web host say they can't help.
Here's the link to the forum:
http://camelphotos.com/camel_forum/index2.php

None of the posts will open and at the top I get this massage.

Warning: Invalid argument supplied for foreach() in [path]/includes/functions_threadedmode.php on line 202

Here's what on line 202:
foreach($ipostarray["$parentid"] AS $id)

Sure would appreciate some help*
Thanks
Roger