title: Hyperledger Composer: command composer network start failing
body: <p>I am trying to deploy a business network using command:</p>
  
  <pre><code>composer network start -c PeerAdmin@hlfv1 -n test-bna -V 0.0.1 -A admin -S adminpw
  </code></pre>
  
  <p>And it is failing with error:</p>
  
  <blockquote>
    <p>Error trying to start business network. Error: Failed to connect to
    any peer event hubs. It is required that at least 1 event hub has been
    connected to receive the commit event.</p>
  </blockquote>
  
  <p>On checking the composer logs, it says:</p>
  
  <blockquote>
    <p>2018-11-08T13:30:59.190Z WARN    :HLFConnection<br>
    :_connectToEventHubs()     event hub localhost:7051 failed to connect:
    12 UNIMPLEMENTED: unknown service protos.Deliver {}$
    2018-11-08T13:31:46.763Z WARN    :HLFConnection<br>
    :_connectToEventHubs()     event hub localhost:7051 failed to connect:
    12 UNIMPLEMENTED: unknown service protos.Deliver {}$</p>
  </blockquote>
  
  <p>Could someone please help with resolving this?</p>