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Internal cryptographic library error when signing document

Adobe Reader marked document signed with PDFCreator as invalid with this error message:

Error during signature verification.
Error encountered while validating:
Internal cryptographic library error.
Error Code: 0x2711

— Czech equivalent —
Chyba v průběhu ověřování podpisu.
Při ověřování se vyskytla chyba:
Interní chyba šifrovací knihovny.
Kód chyby: 0x2711

There is no info available on the internet what does it mean, so I contacted support and the answer was easy – I was signing the document with backup of my private key – there was no certificate present in that file, so there was not way how to calculate hash of the document. The solution is to export the private key including your certificate.

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