title: Perforce "Locked client" error
body: <p>I'm new to Perforce, and it is not going well at all. But currently, I am completely stuck, as all I can get it to say is:</p>
  
  <pre><code>$ p4 open a_code_file.cpp
  Locked client 'my_hostname' can only be used by owner 'perforce'.
  </code></pre>
  
  <p>I have absolutely no idea what I did to upset it, and the error message itself is meaningless gibberish to me. "perforce" doesn't own anything - all the files are owned by me. I am in a Perforce repository, ie, there's a <code>.p4rc</code> a few directories up.</p>
  
  <hr>
  
  <p><strong>Edit:</strong> It only seems to be some files. If I:</p>
  
  <pre><code>$ cd some_other_directory_in_the_repo
  $ p4 open a_file
  </code></pre>
  
  <p>... it works. So it's only some things...</p>