Nano Setup Training Course - Hello Camera issue

Last week I ran through the training from DLI on setup of Nano, all worked fine.

I have the PI CSI camera.

During that, the training asked me to comment-out the lines of code that reference the USB camera. This was no problem.

This week, the training has been changed and there are different ‘hello camera’ scripts for USB and CSI.

The CSI version no longer runs and I get this error on one of the snippets:

“Error creating widget could not find model”

Any tips to fix or workaround - I think this might be an issue with the revised training course.

Figured out the problem - Edge does this, Firefox does not.