GenerateSAMLAssertion is not working

[mainakpaul]

Hi

I'm working in SAML generator and validate but when invoking the apigee endpoint getting this error in postman

{ "fault": { "faultstring": "GenerateSAMLAssertion[SAML]: Error transforming assertion into message.", "detail": { "errorcode": "steps.saml.generate.ErrorUpdatingPayload" } } }

please find the screenshot for the same

Any kind of help and suggestions will be appreciated.

Thanks.