Fatal error: Uncaught Error: Class "Drupal\Core\Plugin\ConfigurablePluginBase" not found in /home/quitpathshareaco/public_html/New/vendor/drupal/core/lib/Drupal/Core/Layout/LayoutDefault.php:15 Stack trace: #0 {main} thrown in /home/quitpathshareaco/public_html/New/vendor/drupal/core/lib/Drupal/Core/Layout/LayoutDefault.php on line 15