Fatal error: Uncaught Error: Interface "Drupal\Core\DependencyInjection\ContainerInjectionInterface" not found in /home/www/drupal8/test/core/modules/workspaces/src/FormOperations.php:18
Stack trace:
#0 {main}
thrown in /home/www/drupal8/test/core/modules/workspaces/src/FormOperations.php on line 18