3D game kit asset teleportation

I followed a tutoriel from https://unity3d.com/fr/learn/tutorials/projects/3d-game-kit/scene-teleportation for the part "Teleporting to Another Scene". And Each time I try to change the transition type to "different zone", I got an error like in the attached image.
Do you know how I can solve this problem ?

Thanks a lot.

 

I have the same error, i hope someone know it

 

Basically I was looking at the code which is messy as hell and I figured out that a 3D object cannot interact with a 2D collider in unity as far as I know. So I removed the Box Collider 2D in the TransitionStart Inspector. Now the TransitionStart Collider will be 3D which means Ellen (3D object) can enter it and it will recognise her. I guess the tutorial is programmed like for like as in 3D objects interact with 3D colliders and 2D with 2D.

Here is an Image:

 

thanks bro! looks like this 3d kit is messy as hell indeed
i've got plenty of problems with it

 

so,there is another problem: i cant add character "ellen" to transitioning game object
neither by drag and drop or by pressing circle on the right
unity version 2019.1.7f1

 

I had the same error. A working solution is:
From File>Build Settings remove all other scenes that you won't built.

 

There are 2 scenes in the build index of the project as downloaded from the asset store. If I'm reading it correctly, SceneNameDrawer.cs makes a fuss because these are making it try to make an array with size of -1