Fatal error: Uncaught Error: Class "setasign\Fpdi\FpdiException" not found in C:\Apache24\htdocs\cms_upgrade\vendor\setasign\fpdi\src\PdfReader\PdfReaderException.php:18 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\cms_upgrade\vendor\setasign\fpdi\src\PdfReader\PdfReaderException.php on line 18