/.polo/.polo_programm/lib/polo_generators.py:611: GtkWarning: gtk_cell_layout_add_attribute: assertion `column >= 0' failed
  widget = gtk.TreeViewColumn(self.attribs['value'], self.renderer, active=int(self.attribs['dataslot']))

'einsender_model' object has no attribute 'mailbox' ['__class__', '__delattr__', '__dict__', '__doc__', '__getattribute__', '__getitem__', '__hash__', '__init__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__setstate__', '__str__', 'args', 'message']