PyHanko CLI addsign pemder gives me an error

[Ziad-Assem]

When I run the following cli code:
pyhanko sign addsig --no-strict-syntax --field Sig1 pemder --key private_key.pem --cert certificate.der gg.pdf output.pdf --no-pass

i get the following error: pyhanko.cli - ERROR - Generic processing error. Error: Generic processing error.

PDF is Spec. Ver 1.7

-I'm trying to digitally sign a PDF using PKCS#7. I used the following bat code to generate the certificate and private key:

private key:
openssl genpkey -algorithm rsa -out private_key.pem -pkeyopt rsa_keygen_bits:2048

certificate:
openssl req -new -x509 -sha256 -key private_key.pem -outform der -out certificate.der -days 365

[MatthiasValvekens]

Hi @Ziad-Assem

Run with pyhanko --verbose and post the stack trace, and preferably also the input file (if you can), since this could be due to pretty much anything :)