
So, strangely, I've encountered this so many times, and have done extensive Google searching, and tried to find a solution on here, to no avail. This always happens to me when using Switch cases.
I have an SP online list/form that has a Choice column that can accept multiple choices. Depending on what is selected, I want to add a user to a group. I have been following this guide, which turns out to be not that helpful. But anyway, I get the above error when it tries to read the Switch case.

What am I missing here, and what does that error actually mean? What can I do when using switch cases to avoid this same error appearing in the future?