OnCollisionEnter is not called in unity

Question

I checked nearly every answer for this, but those were mostly simple errors and mistakes. My problem is that OnCollisionEnter is not called even when colliding whith other r

Answer 1

because you misstyped class name of parameter. this makes no error also not works. eg:

OnCollisionEnter(Collider other) //this is wrong
OnCollisionEnter(Collision other) //this is correct