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Digital signature invalid

I created a self-signed certificate and used it to sign a pdf document.
The signature appears in the output document but has a large red X and the text Signature Invalid

How can I get the X and Signature Invalid text to not appear?

The certificate is in the trusted store (Vista)


Thank you for considering Aspose.

Could you please share you code and certificate you are using. We will then investigate it and will let you knew if we found solution.


Programmer error! You can remove this post. I have it working.

Thank you for consider Aspose product, now the PdfFileSignature only surpport an external signature with the Windows Certificate Mode, and the Self Sign Mode is not surpported. We will investigate this feature and add this function in the next verison.