Fatal error: Uncaught Error: Class "Drupal\Core\Plugin\PluginBase" not found in /home/fnbrshareacopy/public_html/themes/contrib/bootstrap/src/Plugin/Markdown/AllowedHtml/Bootstrap.php:18 Stack trace: #0 {main} thrown in /home/fnbrshareacopy/public_html/themes/contrib/bootstrap/src/Plugin/Markdown/AllowedHtml/Bootstrap.php on line 18