Fatal error: Uncaught Error: Class "PHPExcel_Style_Supervisor" not found in /opt/lampp/htdocs/msjperformancemsn/vendor/phpoffice/phpexcel/Classes/PHPExcel/Style.php:36 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/msjperformancemsn/vendor/phpoffice/phpexcel/Classes/PHPExcel/Style.php on line 36