Fatal error: Call to a member function query_first_slave() [ how to solve it .. ? ]

[ipqtr]

Hi Lynne
I did what you said directly when i faced the problem ,, and there is no change
i cant access any page in the forum ,, all page show the same message :
Fatal error: Call to a member function query_first_slave() on a non-object in /home5/*****/public_html/vb/includes/functions.php on line 1945
and i have already reupload all files of forum and there is no any change ! the message still !

REGARDS

--------------- Added [DATE]1259424607[/DATE] at [TIME]1259424607[/TIME] ---------------

NOTE :
the version of forum is : 3.7.4