Fatal error: Uncaught Error: Class "Drupal\Core\Installer\InstallerKernel" not found in /home/clients/f11c209a30d269a3bb60f012940315b6/sites/dev10.education21.ch/web/core/includes/errors.inc:322 Stack trace: #0 /home/clients/f11c209a30d269a3bb60f012940315b6/sites/dev10.education21.ch/web/core/includes/errors.inc(122): _drupal_get_error_level() #1 /home/clients/f11c209a30d269a3bb60f012940315b6/sites/dev10.education21.ch/web/core/includes/bootstrap.inc(204): error_displayable() #2 /home/clients/f11c209a30d269a3bb60f012940315b6/sites/dev10.education21.ch/web/core/includes/bootstrap.inc(188): _drupal_exception_handler_additional(Object(Error), Object(Error)) #3 [internal function]: _drupal_exception_handler(Object(Error)) #4 {main} thrown in /home/clients/f11c209a30d269a3bb60f012940315b6/sites/dev10.education21.ch/web/core/includes/errors.inc on line 322