Fatal error: Uncaught Error: Class 'Drupal\Component\Plugin\PluginBase' not found in /var/www/html/tmp/contrib/openid_connect/src/Plugin/OpenIDConnectClientBase.php:27 Stack trace: #0 {main} thrown in /var/www/html/tmp/contrib/openid_connect/src/Plugin/OpenIDConnectClientBase.php on line 27