title: docker, invalid reference format
body: <p>I'm new to docker and trying to learn how to push and pull. I've been stuck with this problem for a while. I'm trying to push and image to my docker, but keep getting the same error "Invalid reference format" see picture for details.</p>
  
  <p><a href="https://i.stack.imgur.com/5uO2P.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/5uO2P.png" alt="trying to push to my docker"></a></p>