Error giving permissions to a group

Good afternoon

I'm having trouble giving permissions for a site I created to a group I created, so I own both.

On the site created with the template for libraries, I created several libraries for file sharing. When trying to give permission to the group I created, an error message appears warning that sharing has been disabled by the owner.
I don't see where the error is. Attached, I send a sequence of images to illustrate what I'm saying.
Thank you for your help