Non-object Issue

[The-Ensemble]

Ok I have this line of text in my php functions admin file that keeps getting booted when executed. with the error

Fatal error: Call to a member function on a non-object in {file} on line 8

Line 8:

PHP Code:

  $mainsqry = $vbulletin->db->query_read("SELECT favid, name, displayid FROM " . TABLE_PREFIX . "favavorites_main ORDER BY displayid"); 


Whats the problem? I've switched from $vbulletin->db to $db, that wasn't it, there query layout is the same as other parts of the file that works fine. I don't get what the problem is at all.

Help?