title: Unable to build sencha app even having correct cmd and framework compatible versions
body: <p>There is no debugger remained in all the code.All is fine on local.But as soon I started to build app it shows following error.
  Moreover everything works fine in the development folder. However, when I try to create a production build, I get the following error. </p>
  
  <pre><code>[ERR] BUILD FAILED
      [ERR] com.sencha.exceptions.ExNotFound: Failed to find mixin class: mymixin.language
      [ERR]
      [ERR] Total time: 6 seconds
      [ERR] The following error occurred while executing this 
      line:C:\TestApp\apps\myapp_dev\.sencha\app\build-impl.xml:367: The following error occurred while executing this line:C:\TestApp\apps\myapp_dev\.sencha\app\js-impl.xml:11: com.sencha.exceptions.ExNotFound: Failed to find mixin class: boseui.language9:35:39 PM"C:/Users/myaccount/bin/Sencha/Cmd/4.0.4.84/sencha" app refresh
  </code></pre>