title: Error " docker: invalid reference format, While Spawning anew container using below params
body: <p>While Spawning anew container using below params :</p>
  <pre><code>Name: ‘myapache’,
  Host port: 81,
  Container port: 80,
  </code></pre>
  <p>Should run in detach mode, so I used below command&quot;
  <code>docker run –it -name myapache -p 81:80 -d ubuntu_apache</code>
  and get the error <code>Docker: invalid reference format</code>?</p>
  <p>I can't figure out what is the problem with the command</p>