Help Please, Fatal error : class_dm_forum.php

[AtillaKral]

Hi,

my english is not very well

My forum version upgraded to 3.7.3.

İ took this error massage when i send a new massage and post new thread;

Fatal error: Call to undefined function () in /home/****/domains/*****.com/public_html/includes/class_dm_forum.php on line 13

And there is this massage on 13. line

if (!class_exists('vB_DataManager')).

And, the forum does not show new messages, and i coluld not see the posted massage without look at the thread…

Quickly help please!