Fatal error: Uncaught Error: Class "Drupal\a_module_that_does_not_exist\Plugin\Custom" not found in /home/quitpathshareaco/public_html/New/vendor/drupal/core/tests/fixtures/plugins/Plugin/PluginNamespace/AttributeDiscoveryTest2.php:16 Stack trace: #0 {main} thrown in /home/quitpathshareaco/public_html/New/vendor/drupal/core/tests/fixtures/plugins/Plugin/PluginNamespace/AttributeDiscoveryTest2.php on line 16