usermin-webmail - cant add new folder

Hi,
I've started using usermin-webmail in production instead of squirrelmail, however I've got several problems with it.
The most important is the fact that the client cant add new folders. I go in "manage folder" > "add new folder" (in my case Spam folder), in the folder name field I type "Spam", click "Create" and the errors comes: missing folder name..

Any suggestions?

Status: 
Closed (fixed)