Fatal error: Uncaught Error: Class "Drupal\Core\Theme\Registry" not found in /home/fnbrshareacopy/public_html/themes/contrib/bootstrap/src/Plugin/Alter/ThemeRegistry.php:21 Stack trace: #0 {main} thrown in /home/fnbrshareacopy/public_html/themes/contrib/bootstrap/src/Plugin/Alter/ThemeRegistry.php on line 21