Fatal error: Uncaught Error: Class 'Matrix\Operators\Operator' not found in /home/vtsnised/public_html/anketa2.0/vendor/markbaker/matrix/classes/src/Operators/DirectSum.php:8 Stack trace: #0 {main} thrown in /home/vtsnised/public_html/anketa2.0/vendor/markbaker/matrix/classes/src/Operators/DirectSum.php on line 8