The pointer event is not firing using the Google Cardboad SDK

I have a new scene and added a cube and gave it the events and the gaze script just like in the demo scene.
I also added the Carboad Main prefab to the scene as well as the EventSystem and the GazeInputModule.

But the cube does not change color when the pointer is over it.

Why is it not working ?

I found the problem: One needs to add a “Physics Raycaster” component to the Cardboard Main Camera.

Thank you very much Sir, helped me when I needed it.