Fatal error: Uncaught Error: Class 'SimpleSAML\Auth\ProcessingFilter' not found in /var/www/html/simplesamlphp/modules/core/src/Auth/Process/CardinalitySingle.php:21
Stack trace:
#0 {main}
  thrown in /var/www/html/simplesamlphp/modules/core/src/Auth/Process/CardinalitySingle.php on line 21