Yo, I’m following the same tutorial and getting stuck in the same place.
Basically the problem is that when you go to drop in Ellen, the player, the script doesn’t let you drop her in as the transitioning game object. I even went to the developer levels to see if I could delete Ellen from the transitioning game object and re-drag and drop her.
The script still refused to add her.
Note this problem doesn’t happen when you transition within the same scene
Link to the section in particular: 2D Game Kit Walkthrough - Unity Learn
Check out this post in the official tutorial guide, someone is having the same problem (They put in good pictures of the same exact problem I got): 2D Game Kit Official Thread page-6#post-4287751