title: vNext build initialize job fails with "Object reference not set to an instance of an object."
body: <p>All my vNext builds were working fine, suddenly started receiving "Object reference not set to an instance of an object." error in the initialize job.  </p>
  
  <p><img src="https://i.stack.imgur.com/TBpMy.png" alt="vNext build initialize job error"></p>
  
  <p>Any issue or mistake from Build Agent setup?</p>