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    Use tcpdf digital signature
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    Posted by halilurrahman  · 26-04-2020 - 06:58

    I want to use the example 52 of TCPDF, but this warning goes out for me, and
    not as solving it

    Warning: openssl_pkcs7_sign() : error getting private key in
    C:\wamp\www\tcpdf\tcpdf.php on line 7878

    Notice: Undefined offset: 1 in C:\wamp\www\tcpdf\tcpdf.php on line 7890
    TCPDF ERROR: Some data has already been output, can't send PDF file