group error in D7.5

I have added videos to my group and working good
fans add videos in group and get "error! File not found" (I setup option for fans: can add videos and file photos in my group and setings)

http://coozila.com/m/groups/view/digitalcafetv

Can not reproduce this error, I have just successfully uploaded video from group admin and group fan:

http://www.demozzz.com/dolphin7b/m/groups/view/Test-Group