Fatal error: Uncaught Error: Class "MediaWiki\Extension\Math\InputCheck\BaseChecker" not found in /home/hiphopdi/public_html/wiki2/extensions/Math/src/InputCheck/MathoidChecker.php:11 Stack trace: #0 {main} thrown in /home/hiphopdi/public_html/wiki2/extensions/Math/src/InputCheck/MathoidChecker.php on line 11