Hello Aravind,
can you please add the complete trace file to this thread.
The error says that in verify.pse there is no public key from the signer (ticket issuing system). This is the typical error if not trust is created from issuer to verifier.
If possible you should create a OSS ticket to SAP. If your are not a customer, then you should add / upload the ticket and the verify.pse so that I can check the problem.
My PGP key is:
PGP Key-Id: 0x0B9EA3F1 | PGP Key-Server: https://keyserver.pgp.com
With that you can encrypt data which should not be visible to all.
regards,
-markus