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Tcpdf digital signature is not working (eg. 52)

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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