Mustafa in this domain can not create new email accounts in updating 6.5.0.f-2013031820. However, in the version 6.5.0.f-2013031819 can, so the error is somewhere in the update.
I think the use of the start of your Kloxo-mr after referring to members simply I re-server for ZPanel. Because I'm tired of reading because I work and still finding and correcting errors that give the stable releases.
At this rate you'll end up doing it that you do for yourself Kloxo-o, because no one will want to use your product.