Unexpected byte range values defining scope of signed data. Details: The signature byte range is invalid

Used TCPDF for adding a digital signature to the document, Copied solution from here , The error I am keep getting is Unexpected byte range values defining scope of signed data. Details: The signature byte range is invalid Error in adobe Code:

        $pdf = new \TCPDF(PDF_PAGE_ORIENTATION, PDF_UNIT, PDF_PAGE_FORMAT, true, 'UTF-8', false);
        $pdf->SetCreator(PDF_CREATOR);
        $pdf->SetAuthor('Nicola Asuni');
        $pdf->SetTitle('TCPDF Example 052');
        $pdf->SetSubject('TCPDF Tutorial');
        $pdf->SetKeywords('TCPDF, PDF, example, test, guide');

        $pdf->SetHeaderData(PDF_HEADER_LOGO, PDF_HEADER_LOGO_WIDTH, PDF_HEADER_TITLE.' 052', PDF_HEADER_STRING);
        $pdf->setHeaderFont([PDF_FONT_NAME_MAIN, '', PDF_FONT_SIZE_MAIN]);
        $pdf->setFooterFont([PDF_FONT_NAME_DATA, '', PDF_FONT_SIZE_DATA]);
        $pdf->SetDefaultMonospacedFont(PDF_FONT_MONOSPACED);
        $pdf->SetMargins(PDF_MARGIN_LEFT, PDF_MARGIN_TOP, PDF_MARGIN_RIGHT);
        $pdf->SetHeaderMargin(PDF_MARGIN_HEADER);
        $pdf->SetFooterMargin(PDF_MARGIN_FOOTER);
        $pdf->SetAutoPageBreak(TRUE, PDF_MARGIN_BOTTOM);
        $pdf->setImageScale(PDF_IMAGE_SCALE_RATIO);

        $certificate = 'file://'.public_path().'/tcpdf.crt';
        $info = [
            'Name' => 'TCPDF',
            'Location' => 'Office',
            'Reason' => 'Testing TCPDF',
            'ContactInfo' => 'http://www.tcpdf.org',
        ];
        $pdf->setSignature($certificate, $certificate, 'tcpdfdemo', '', 2, $info);
        $pdf->SetFont('helvetica', '', 12);
        $pdf->AddPage();
        $text = 'This is a digitally signed document';
        $pdf->writeHTML($text, true, 0, true, 0);
        $pdf->setSignatureAppearance(180, 60, 15, 15);
        $pdf->addEmptySignatureAppearance(180, 80, 15, 15);
        $pdf->Output('example_052.pdf', 'I');

via Chebli Mohamed