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Vin BVin B 

Okta SSO with Salesforce org -ERROR- SAML Idp Initiated SS Failed: Signature Invalid

I am trying to set up OKTA with Salesforce. I have configured SSO in slaesforce as mentioned in https://saml-doc.okta.com/SAML_Docs/How-to-Configure-SAML-2.0-in-Salesforce.html . However, When I try to Login using SSO i get Error -Signature invalid. I am sure that I have uploaded the certificate provided in the mentined link. Does Okta Integration not work with Developer ORG?
See below error information in SAML Validator:
11. Validating the Signature
  Is the response signed? true
  Is the assertion signed? false
  The reference in the response signature is valid
  Signature or certificate problems
  The signature in the response is not valid
  Is the correct certificate supplied in the keyinfo? false

Please can anybody guide me what I am missing here?