2018/03/24 10:17:08 - <type 'exceptions.KeyError'> Exception in Tk callback
  Function: <bound method Dialog._userDeleteWindow of <_Pmw.Pmw_1_3.lib.PmwDialog.Dialog instance at 0x7fbb5aa90a28>> (type: <type 'instancemethod'>)
  Args: ()
Traceback (innermost last):
  File "/usr/lib/python2.7/dist-packages/Pmw/Pmw_1_3/lib/PmwBase.py", line 1747, in __call__
    return apply(self.func, args)
  File "/usr/lib/python2.7/dist-packages/Pmw/Pmw_1_3/lib/PmwBase.py", line 1022, in _userDeleteWindow
    self._userDeleteFunc()
  File "/usr/lib/python2.7/dist-packages/Pmw/Pmw_1_3/lib/PmwDialog.py", line 132, in _doCommand
    return command(name)
  File "/usr/local/lib/python2.7/dist-packages/uhdas/serial/tk_terminal.py", line 78, in execute
    button_function[result]()
<type 'exceptions.KeyError'>: None
2018/03/24 10:27:14 - <type 'exceptions.KeyError'> Exception in Tk callback
  Function: <bound method Dialog._userDeleteWindow of <_Pmw.Pmw_1_3.lib.PmwDialog.Dialog instance at 0x7fbb5aa9edd0>> (type: <type 'instancemethod'>)
  Args: ()
Traceback (innermost last):
  File "/usr/lib/python2.7/dist-packages/Pmw/Pmw_1_3/lib/PmwBase.py", line 1747, in __call__
    return apply(self.func, args)
  File "/usr/lib/python2.7/dist-packages/Pmw/Pmw_1_3/lib/PmwBase.py", line 1022, in _userDeleteWindow
    self._userDeleteFunc()
  File "/usr/lib/python2.7/dist-packages/Pmw/Pmw_1_3/lib/PmwDialog.py", line 132, in _doCommand
    return command(name)
  File "/usr/local/lib/python2.7/dist-packages/uhdas/serial/tk_terminal.py", line 78, in execute
    button_function[result]()
<type 'exceptions.KeyError'>: None
2018/03/24 10:27:28 - Exception in thread Thread-2:
Traceback (most recent call last):
  File "/usr/lib/python2.7/threading.py", line 810, in __bootstrap_inner
    self.run()
  File "/usr/lib/python2.7/threading.py", line 763, in run
    self.__target(*self.__args, **self.__kwargs)
  File "/usr/local/lib/python2.7/dist-packages/uhdas/serial/tk_terminal.py", line 409, in listen
    cc = os.read(self.fd, 500)
OSError: [Errno 9] Bad file descriptor