Hello, my ball with a circle Collider in it goes into the cube with a box Collider in it is this unity error?
Circle Collider is a 2D collider. 2D and 3D colliders do not work together in unity. You should use a sphere collider for the ball instead.
Try moving the ball above the cube, this shouldn’t matter as unity usually pushes the sphere above/below the nearest collision face, if this doesn’t work my suggestion would be to simply re-add the ball and if that doesn’t work re-add the box, Generally collisions on the base shapes inside unity should work as soon as imported into the scene, to narrow it down:
First. Try to raise the sphere above the cube (you may want gravity enabled so it falls onto the cube, though this setting relies on what type of game you’re making)
Second. If that doesn’t work re-add the sphere and cube.