Fatal error: Uncaught TCPdiParserException

[plysystems]

I got the following error:

Uncaught TCPdiParserException: Empty PDF data. in D:\Programme\laragon\www\projects\Name Of Project\tools\lib\classes\tcpdf\tcpdi_parser.php:1425 Stack trace: #0 D:\Programme\laragon\www\projects\Name Of Project\tools\lib\classes\tcpdf\tcpdi_parser.php(203): tcpdi_parser->Error('Empty PDF data.') #1 D:\Programme\laragon\www\projects\Name Of Project\tools\lib\classes\tcpdf\tcpdi.php(121): tcpdi_parser->__construct(false, 'lib/temp/', 'exception') #2 D:\Programme\laragon\www\projects\Name Of Project\tools\lib\classes\tcpdf\tcpdi.php(88): TCPDI->_getPdfParser('lib/temp/') #3 D:\Programme\laragon\www\projects\Name Of Project\tools\lib\classes\PDFMerger.php(97): TCPDI->setSourceFile('lib/temp/') #4 D:\Programme\laragon\www\projects\Name Of Project\tools\public\pages\pdfmerge.php(21): PDFMerger\PDFMerger->merge('browser', 'lib/temp/Test.p...') #5 D:\Programme\laragon\www\projects\Name Of Project\tools\lib\classes\system.php(53): include('D:\Programme\la...') #6 D:\Programme\laragon\www\projects\Name Of Project\tools\index.php(18): sys::view('pdfmerge') #7 {main} thrown in D:\Programme\laragon\www\projects\Name Of Project\tools\lib\classes\tcpdf\tcpdi_parser.php on line 1425

My Code:

if (!empty($_FILES['file_name']['name'][0])){
        $file_ary   = tool::reArrayFiles($_FILES['file_name']);
        $pdf        = new \PDFMerger\PDFMerger;
        $uploadTo   = "lib/temp/"; 
        $filename   = $uploadTo.basename($_POST['doc_name'].'.pdf');

        foreach ($file_ary  as $file) {
            $basename       = basename($file["name"]);
            $originalPath   = $uploadTo.$basename; 
            $tempPath       = $file["tmp_name"];
            if(move_uploaded_file($tempPath,$originalPath)){
                $pdf->addPDF($uploadTo.$filex, 'ALL');
            }
        }

        $pdf->merge('browser', $filename);
}