Fatal error: Uncaught Error: Interface "PhpOffice\Math\Writer\WriterInterface" not found in /home/www/whatsmark.edgt.me/vendor/phpoffice/math/src/Math/Writer/MathML.php:10 Stack trace: #0 {main} thrown in /home/www/whatsmark.edgt.me/vendor/phpoffice/math/src/Math/Writer/MathML.php on line 10