Figured it out. I remembered that there were a lot of other posts about a null reference exception. This post fixed my issue:
Apparently there is a bug in the code that is not fixed until a later lecture. Adding a simple extra conditional to the Update method in Quiz.cs will fix it.
With all due respect, I don’t know why there is no update in the “Lists” video to explain this issue. It’s been going on for over a year. I’ll echo what others have said that this whole section seems to be a bit of a mess.
For me, I had no issues until the timer lecture. After that, it’s been a struggle. I’m no coding expert, but I have been working professionally in R as a researcher for 5 years and am still having difficulties with the last few lectures. I can only imagine how frustrating it would be for someone with zero coding experience.
Still think overall the course is great and both lecturers are good, don’t regret purchasing it or anything like that.
But it’s clear this section needs another refresher. Some of these sections need to be broken in 2 smaller videos, and include some more emphasis on troubleshooting and talking about common errors. That was discussed in the Driver and Snowboarder sections, but hasn’t been touched on here at all.