title: what is causing this error message [Error]: "Client 'host' unknown - use 'client' command to create it."?
body: <p>Whenver I try to run p4 command <code>p4 change -o</code> or pythonically <code>p4.fetch_change()</code></p>
  
  <p>I get this error message !</p>
  
  <p>[Error]: "Client 'hostname' unknown - use 'client' command to create it."</p>
  
  <p>Does anyone know why am I getting this ? </p>