error

Traceback (most recent call last):
  File "/home/ciccio/linuxcnc/configs/3040t_no-endstops/arduino.py", line 62, in <module>
    temp = ser.read(5)
  File "/usr/local/lib/python2.7/dist-packages/serial/serialposix.py", line 501, in read
    'device reports readiness to read but returned no data '
serial.serialutil.SerialException: device reports readiness to read but returned no data (device disconnected or multiple access on port?)
^Ctask: 7308 cycles, min=0.000039, max=0.023973, avg=0.010303, 0 latency excursions (> 10x expected cycle time of 0.010000s)
Exception in Tkinter callback
Traceback (most recent call last):
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1437, in __call__
    return self.func(*args)
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 498, in callit
    func(*args)
  File "/usr/bin/axis", line 776, in update
    root_window.update_idletasks()
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 934, in update_idletasks
    self.tk.call('update', 'idletasks')
KeyboardInterrupt
Shutting down and cleaning up LinuxCNC...