Why do I get error "General security error (No certificates were found for decryption (KeyId))"?

[IgorNoskov]

Thank you so much for this library!

When using the library I get an error "General security error (No certificates were found for decryption (KeyId))". When I don't set up service security object, the request goes through, and I see in the logs how the third party service respond to me. But the library throws an error "Call to a member function getPublicKey() on null".

How can I solve this problem?