pi@raspberrypi:~ $ sudo ~/diddyborg/diddyPreview.py
Traceback (most recent call last):
  File "/home/pi/diddyborg/diddyPreview.py", line 29, in <module>
    camera.remove_overlay(0)
  File "/usr/lib/python2.7/dist-packages/picamera/camera.py", line 908, in remove_overlay
    "The specified overlay is not owned by this instance of "
picamera.exc.PiCameraValueError: The specified overlay is not owned by this instance of PiCamera
pi@raspberrypi:~ $