OnCollisionEnter not running.

I'm trying to allow my player to detect collisions to walls but nothing would happen, i soon realized the problem was happening because OnCollisionEnter was never running no matter what i was collided with. My wall has a box collider and a rigid body with is kinematic ticked and my player has a character controller and a capsule collider. No idea why this isn't working, please help. My code looks like this:

 void OnCollisionEnter(Collision other){
     print ("Wall");
 }

this is running after update().