Unity app not running in Android phone.

Hi, I have made a simple VR app using unity 5.3. It consists of a 3D model. I have used FPS controller as well as Cardboard main. The app runs absolutely fine in unity(ctrl+P). But when I create an apk file and try running it in mobile, my scene is not moving at all. I could only hear the first foot step of the FPS. Other than that nothing happens.

One more app which consists of a terrain and it is viewed through FPS controller. When I run it in mobile, its not moving as well.

Could anyone please help me? How can run it in mobile?