[Discuss-gnuradio] gr-inspector failing with "AttributeError: 'module' object has no attribute 'signal_detector_cvf'"

 After a lot of hard work I finally have gr-inspector loading in gnuradio.  I am trying to execute the signal detection example in gnuradio-companion and am getting this error:

Generating: '/gr-inspector/examples/signal_detection.py'

Executing: /usr/bin/python2 -u /gr-inspector/examples/signal_detection.py

Traceback (most recent call last):
  File "/gr-inspector/examples/signal_detection.py", line 151, in <module>
    main()
  File "/gr-inspector/examples/signal_detection.py", line 139, in main
    tb = top_block_cls()
  File "/gr-inspector/examples/signal_detection.py", line 72, in __init__
    self.inspector_signal_detector_cvf_0 = inspector.signal_detector_cvf(samp_rate, 4096, firdes.WIN_BLACKMAN_hARRIS,

AttributeError: 'module' object has no attribute 'signal_detector_cvf'

 Any idea what's going on?