title: Upgraded from Marionette 1.8.3 to 2.0.1, getting error Cannot read property 'channel' of undefined
body: <p>I upgraded from Marionette 1.8.3 to 2.0.1 as I was having problems with view events being destroyed on my ItemViews but I now get the error at line 2869 of lib\backbone.marionette.js:</p>
  
  <p>var globalCh = <strong>Backbone.Wreqr.radio</strong>.channel('global');</p>
  
  <p>error: Cannot read property 'channel' of undefined</p>
  
  <p>I was using version 1.3.1 of Backbone.Wreqr but I still get the error.  </p>
  
  <p>Things I have tried:</p>
  
  <ul>
  <li>I have tried using the files without Wreqr &amp; Babysitter included but still get the error.</li>
  <li>I have added Wreqr and Babysitter to the paths in require_config but my version of Wreqr seems to get overridden by another(don't know where this comes from) that doesn't contain Wreqr.radio</li>
  </ul>
  
  <p>I have uninstalled Backbone.Wreqr and installed Backbone.Radio and changed the line above to: </p>
  
  <p>var globalCh = <strong>Backbone.Radio</strong>.channel('global'); </p>
  
  <p>I don't really want to do this as we tend to use the downloaded versions as they are without any changes.</p>
  
  <p>Is there something specific that I should be installing along with the upgraded Marionette 2.0.1?</p>