Hi Mauricio,
This looks like a different issue to the other post now where the ball wasn’t reaching the paddle. Is that still an issue? If not, can you mark that topic as closed.
With regards to this one, check that the Paddle has a Rigidbody2D component and also that it’s Is Trigger property is unticked.
For code, it’s typically better to just copy/paste into your posts and then apply the code formatting characters before and after it - this allows those that help you to copy/paste chunks of your code back to you in a reply, where necessary. Screenshots are great for issues within the Unity editor itself though.
See also;