Socialgroups image not shown
 

When i create a socialgroup i can upload a picture.

Then there is a error:

Warning: fopen[function.fopen]: Filename cannot be empty in [path]/includes/class_image.php on line 333

But the pictures are not shown at the socialgroups-page

See it at:

http://www.bb-helpdesk.com/group.php


What did i do wrong?