I am also getting an error on osx 10.10

Traceback (most recent call last):
  File "./hashmal", line 17, in
    gui.main()
  File "/Users/bbuenz/Programmierung/CryptoWorkspace/hashmal/hashmal_lib/__init__.py", line 14, in main
    self.main_window = HashmalMain(self.app)
  File "/Users/bbuenz/Programmierung/CryptoWorkspace/hashmal/hashmal_lib/main_window.py", line 38, in __init__
    self.dock_handler.do_default_layout()
  File "/Users/bbuenz/Programmierung/CryptoWorkspace/hashmal/hashmal_lib/dock_handler.py", line 90, in do_default_layout
    self.dock_widgets['Variables'].setVisible(True)
KeyError: 'Variables'