title: Docker cp: Error response from daemon: lstat no such file or directory
body: <p>I'm learning about containers docker, I'm still in the basics.. When I try to use the command <code>docker cp</code>,to copy an file from the container to the local host direcotory the output returns an error.
  I type:</p>
  <pre><code>docker cp bridge:/home/arq3.txt .
  </code></pre>
  <p>the output:</p>
  <blockquote>
  <p>Error response from daemon: lstat
  /var/lib/docker/aufs/mnt/231afc03ee896d66b09ed3c4d1d057a73eeed4f6182c3108dcbfb5b3337c8fa5/home/arq3.txt:
  no such file or directory</p>
  </blockquote>
  <p>Second the documentation of docker the syntax is right, so what I doing wrong? And what is this directory <code>var/lib/docker/aufs/mnt/231afc03ee896d66b09ed3c4d1d057a73eeed4f6182c3108dcbfb5b3337c8fa5/</code>?</p>