Fatal error: Uncaught Error: Class 'Drupal\Core\Plugin\PluginBase' not found in /var/www/html/tmp/contrib/entity/tests/modules/entity_module_bundle_plugin_test/src/Plugin/BundlePluginTest/First.php:17 Stack trace: #0 {main} thrown in /var/www/html/tmp/contrib/entity/tests/modules/entity_module_bundle_plugin_test/src/Plugin/BundlePluginTest/First.php on line 17