Digital Signature issue with Adobe Form

Dear members,

I have a Adobe Form in my current development which is having Digital Signature set and working fine.

When I have created a new Adobe Form, in which I am calling the same Digital Signature, I am getting below error -

1. com.adobe.ProcessingException: Signature failure error detected while certifying a PDF for credential alias: DocumentCertification

Processing exception during a "Certify" operation.#Request start time: Mon May 26 16:16:45 BST 2014#com.adobe.ProcessingException: Signature failure error detected while certifying a PDF for credential alias: DocumentCertification##Specific error informat

Am I passing wrong parameters or missing something.

  fp_params-NODIALOG   = 'X'.
   fp_params-connection = 'ADS_HTTPS'.
   fp_params-getpdf     = 'X'.
   fp_params-dest       = ls_itcpo-tddest.
   fp_params-nodialog   = 'X'.

   fp_docparams-FILLABLE   = 'N'.

Its not an interactive form.

Any advice would be helpful.

Thank you.

Regards,

Arpit Varma.