Fatal error: Uncaught Error: Class "FPDF" not found in D:\xampp\htdocs\ssw_doc\vendor\setasign\fpdi\src\FpdfTpl.php:18 Stack trace: #0 {main} thrown in D:\xampp\htdocs\ssw_doc\vendor\setasign\fpdi\src\FpdfTpl.php on line 18