Fatal error: Uncaught Error: Class "Matrix\Operators\Operator" not found in E:\www\frey\qgmvc\v1.0\composer\vendor\markbaker\matrix\classes\src\Operators\DirectSum.php:8 Stack trace: #0 {main} thrown in E:\www\frey\qgmvc\v1.0\composer\vendor\markbaker\matrix\classes\src\Operators\DirectSum.php on line 8