Fatal error: Uncaught Error: Interface "Drupal\Core\Authentication\AuthenticationProviderInterface" not found in /home/www/drupal8/test/core/modules/basic_auth/src/Authentication/Provider/BasicAuth.php:19 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/basic_auth/src/Authentication/Provider/BasicAuth.php on line 19