Could you please describe the steps taken before this error occured? I can see from the URL that it occured in the group photo albums for the "Web design" demo group, but cannot reproduce it.

Thnaks for your reply. I wish i could install this perfect software to my server. But i couldnt install by your steps. Because ı take varchar datatime value error in installation precess. So, i tried to query your installation sql scripts one by one and bingo all of them established database and ı was online. But at them moment i am taking this error on groups. Because of codes ar closed i can not research the reason. Thanks for your valueable helps again.

It seems that something went wrong during your manual installation process, as we cannot replicate this situation. Does this happen immediatelly when you go to the group page or when you perform some operations first?