well this work around helped for creating the fodlers but i still can not assign user roles to the folders. i still get the same treenode error. i've tried the recursive sync on the DB. does anyone have anymore ideas for a fix? thanks.

Hi,
I had the same problem. I nociced that the error message does not appear if I select the original skin of dnn. That means there is a problem with your skin. As I diasbled the javascript in my skin, everything was ok. So you can do the same or you can select an other skin for the pages which have file manager.