Having a Drupal 8 site under development with a customer aware of the risk of loosing data I took the risk of fixing a broken Drupal 8 site. Today I did an code update and got the following welcome screen on http://drupal.dev

If you have just changed code (for example deployed a new module or moved an existing one) read http://drupal.org/documentation/rebuild<br>Additional uncaught exception thrown while handling exception.<br>Original<br>