Rigidbody with box collider falling through another rigidbody with box collider

I have a Vuforia project where my player keeps falling through the ground even though both of them have rigidbody and box colliders. When I ran this before adding Vuforia to the project, this worked fine. The player was able to move over the ground without any problem. Everytime I try to run it in AR using markers I have this problem where the player keep falling through the ground. I've tried to put the player well above the ground to give it enought time to initialize the components, but it didn't work as well.

This is the player: ![This is the player's settings][1]
This is the ground: ![This is the ground's settings][2]

Does anyone know what's wrong here? [1]: /storage/temp/147253-player.png [2]: /storage/temp/147254-ground.png