title: Chef - unable to solve dependencies in alotted time
body: <p>When I run chef-client the execution sometimes fail with this error and "Preconditions failed" message. </p>
  
  <p>The first time it came I deleted the older versions of cookbooks I had in the server and it fixed this. However I still get this, intermittently.</p>
  
  <p>What is the exact cause that produces this result? </p>