App lab - screen won't change on click

(App Lab -

What I expect to happen: on line 28 there is code to make the screen change when button is clicked but it does not. Same code in line 10 works perfectly.
What actually happens:Nothing!
I’m attaching my remix but I haven’t altered the code. I have renamed the button and screen but that did not make a difference.

It looks to me like you have the wrong ID for that button.

Lesson learned - make them label each button clearly!! Thank you!