Fatal error in Admin CP

[rish123]

Please Guys
HElp Me OUt Here
Im Gettin THis Error When im Make New Section or edit section
do u know wht can i do

Fatal error: Field uttpoints_perthread is not defined in $validfields in class vb_datamanager_forum in /includes/class_dm.php on line 485

Well i have this on class_dm.php on line 485

trigger_error("Field <em>$fieldname</em> is not defined in <em>\$validfields</em> in class <strong>" . get_class($this) . "</strong>", E_USER_ERROR);

thanks