Fatal error: Uncaught Error: Class 'Matrix\Operators\Operator' not found in /srv/disk3/4464330/www/back.ticket-el.com/vendor/markbaker/matrix/classes/src/Operators/DirectSum.php:8 Stack trace: #0 {main} thrown in /srv/disk3/4464330/www/back.ticket-el.com/vendor/markbaker/matrix/classes/src/Operators/DirectSum.php on line 8