MDC-102 Kotlin: setUpToolbar method doesn't exist

[ProfAvery]

In Step 3 - Add a top app bar:

Now add a call to the setUpToolbar method we added to the content of the onCreateView() method with the following.

We never added a setUpToolbar method, so presumably this is referring to the call to setSupportActionBar.

[16kp]

I came across the same issue and was going to report it. How can I contribute to fix this issue?