Fatal error: Uncaught Error: Interface "Drupal\Component\Plugin\PluginInspectionInterface" not found in /home/www/drupal8/test/core/modules/help/src/HelpSectionPluginInterface.php:18
Stack trace:
#0 {main}
thrown in /home/www/drupal8/test/core/modules/help/src/HelpSectionPluginInterface.php on line 18