Keep getting this error despite adding "SampleScene" to the shared scenes list

How do I fix this? Every youtube video I checked says to do the same thing as add all your scenes in the shared scenes list, yet it doesn't actually fix the issue

I used this video: [https://youtu.be/paaBTt5GcMU](https://youtu.be/paaBTt5GcMU)

Not the same game she is making however I used her tutorial for my start menu. My exit button works fine, my start button gives the error shown on the post

Early answers are appreciated as I'm running on a deadline and have to submit this tomorrow