lightingManager.py not loading .json correctly #2

Received the following error when loading the .json file in Maya2019 (Product version: 2019.0.0.F) from C:/Users/<user>/Documents/maya/lightManager\lightFile_0916.json

# Traceback (most recent call last):
#   File "C:/Users/oleu/Documents/maya/2019/scripts\lightingManager.py", line 178, in importLights
#     self.setButtonColor()
# AttributeError: 'NoneType' object has no attribute 'intensity'

.json extendson changed to .txt
lightFile_0916.txt

I coded along with the videos and had no errors up until video "69. Importing Our Lights".
Went back and checked my code against yours. Still didn't work. I loaded your example file and the same error was returned.
Not sure if its something that's changed in Maya 2019 or Python/ PyMel/ Qt/ etc. syntax, or if it's a system specific/ user error (probably the later).
Thanks!