Two objects with Rigidbodies and Colliders, yet collision script not working!

I have a sphere and a cube. Both have rigidbodies and colliders, yet the collision script is not working. I’ve also played around with the kinematic/gravity boxes but to no avail.

Debug.Log is still not displaying in the console window…

Kindly see screenshots below and check what’s wrong with the object’s properties in the inspector.
I’m not really sure what’s wrong with the object’s properties or with the code

Sphere and Cube Properties

Script

Kindly tell me if you see or don’t see any errors in my file.

The method name should be OnCollisionEnter, not onCollisionEnter.