Traceback (most recent call last):
  File "/usr/bin/willowng-config", line 190, in <module>
    foo = MainWindow()
  File "/usr/bin/willowng-config", line 66, in __init__
    os.execvp('willowng-config', ())
  File "/usr/lib/python2.7/os.py", line 344, in execvp
    _execvpe(file, args)
  File "/usr/lib/python2.7/os.py", line 380, in _execvpe
    func(fullname, *argrest)
ValueError: execv() arg 2 must not be empty