error in error handler: TypeError: 'NotImplementedType' object is not callable

[CarlFK]

sudo hdmi2usb-mode-switch --mode operational
Traceback (most recent call last):
File "/usr/bin/hdmi2usb-mode-switch", line 11, in
load_entry_point('hdmi2usb.modeswitch==0+unknown', 'console_scripts', 'hdmi2usb-mode-switch')()
File "/usr/share/hdmi2usb-mode-switch/hdmi2usb/modeswitch/cli.py", line 207, in main
raise NotImplemented("Not yet finished...")
TypeError: 'NotImplementedType' object is not callable

I can figure it out, but I burn up time trying to figure it out. mostly double checking that I don't see some other error.