title: Upgrade from Megento 2.0.2 fails "An error has happened during application run. See exception log for details."
body: <p>Magento 2.0.2 on CentOS using Bitnami stack. Followed command line upgrade using Composer.</p>
  
  <p>Trying to load the shop front after upgrade (followed steps without errors) results in the error above. The /var/log/exception.log file shows:- </p>
  
  <pre><code>[2016-06-09 15:18:04] main.CRITICAL: exception 'Magento\Framework\Exception\LocalizedException' with message 'Source class "" for "Magento\Framework\App\Response\Http\Interceptor" generation does not exist.' in /opt/bitnami/apps/magento/htdocs/lib/internal/Magento/Framework/Code/Generator.php:171
  Stack trace:
  0 /opt/bitnami/apps/magento/htdocs/lib/internal/Magento/Framework/Code/Generator.php(100): Magento\Framework\Code\Generator-&gt;tryToLoadSourceClass('Magento\\Framewo...', Object(Magento\Framework\Interception\Code\Generator\Interceptor))
  1 /opt/bitnami/apps/magento/htdocs/lib/internal/Magento/Framework/Code/Generator/Autoloader.php(35): Magento\Framework\Code\Generator-&gt;generateClass('Magento\\Framewo...')
  2 [internal function]: Magento\Framework\Code\Generator\Autoloader-&gt;load('Magento\\Framewo...')
  3 /opt/bitnami/apps/magento/htdocs/lib/internal/Magento/Framework/ObjectManager/Factory/AbstractFactory.php(105): spl_autoload_call('Magento\\Framewo...')
  4 /opt/bitnami/apps/magento/htdocs/lib/internal/Magento/Framework/ObjectManager/Factory/Compiled.php(88): Magento\Framework\ObjectManager\Factory\AbstractFactory-&gt;createObject('Magento\\Framewo...', Array)
  5 /opt/bitnami/apps/magento/htdocs/lib/internal/Magento/Framework/ObjectManager/Factory/Compiled.php(130): Magento\Framework\ObjectManager\Factory\Compiled-&gt;create('Magento\\Framewo...')
  6 /opt/bitnami/apps/magento/htdocs/lib/internal/Magento/Framework/ObjectManager/Factory/Compiled.php(67): Magento\Framework\ObjectManager\Factory\Compiled-&gt;get('Magento\\Framewo...')
  7 /opt/bitnami/apps/magento/htdocs/lib/internal/Magento/Framework/ObjectManager/ObjectManager.php(57): Magento\Framework\ObjectManager\Factory\Compiled-&gt;create('Magento\\Framewo...', Array)
  8 /opt/bitnami/apps/magento/htdocs/lib/internal/Magento/Framework/App/Bootstrap.php(233): Magento\Framework\ObjectManager\ObjectManager-&gt;create('Magento\\Framewo...', Array)
  9 /opt/bitnami/apps/magento/htdocs/index.php(38): Magento\Framework\App\Bootstrap-&gt;createApplication('Magento\\Framewo...')
  10 {main} [] []
  }
  </code></pre>
  
  <p>Checked permissions and cleared var/cache manually, but to no avail.</p>
  
  <p>Any ideas how I can resolve this error?</p>