error uploading a file in communication submenu

[nangi]

hello,
when I try to upload a file on a topic that I've created under E-learnin Menu >> Communication ,
I've got the below error,

Fatal error: Call to a member function subFileToUsedSpace() on a non-object in /home/pozitifa/public_html/yeni/doceboLms/modules/item/item.php on line 165
the version is 4.0.5

I've also the version 4.0.4 on another server but there is no error like this...

what is the problem?

regards

[max]

Hi Nangi,
is there any difference in configuration between a server and the other one?