Basic joins, Compass error

I got this error in Compass and I cant figure out where the error is:

I have the same problem, not sure but reckon that the problem came from the Mongo version, at the video lecture they use MongoDB 3.6 but I have installed MongoDB 4.0.8

Anyone has any idea how to run this with MongoDB 4.0.8 ? ?

I make it work, still not sure what was the mistake.

I found useful the information posted at this other comment ->