Fatal error: Uncaught Error: Class "ImgData" not found in /var/www/html/upload/PhpSpreadsheet-master/vendor/mitoteam/jpgraph/src/lib/imgdata_squares.inc.php:11 Stack trace: #0 {main} thrown in /var/www/html/upload/PhpSpreadsheet-master/vendor/mitoteam/jpgraph/src/lib/imgdata_squares.inc.php on line 11