Fatal error: Uncaught Error: Class 'PHPExcel_Style_Supervisor' not found in C:\xampp\htdocs\enercard\vendor\phpoffice\phpexcel\Classes\PHPExcel\Style\Border.php:28 Stack trace: #0 {main} thrown in C:\xampp\htdocs\enercard\vendor\phpoffice\phpexcel\Classes\PHPExcel\Style\Border.php on line 28