saml SSO configuration is not working

Following below link to configure saml SSO, but seeing below error when we hit destination app from source app

1. Followed below the oracle bog to configure saml SSO in weblogic

https://blogs.oracle.com/blogbypuneeth/post/steps-to-configure-saml-20-with-weblogic-server-using-embedded-ldap-as-a-security-store-only-for-dev-environment

2. Receiving below error while navigating from Source App to Destination App

while redirecting /saml2/sp/acs/post receiving 403 forbidden error

Log

SAML2CredentialMapper: getCredentialInternal(): Invalid configuration, returning null

[Security:096578]Can't generated assertion for the user. com.bea.security.saml2.service.SAML2DetailedException: [Security:096578]Can't generated assertion for the user. at com.bea.security.saml2.service.sso.SSOServiceProcessor.getAssertionForUser(SSOServiceProcessor.java:403) at com.bea.security.saml2.service.sso.SSOServiceProcessor.sendResponse(SSOServiceProcessor.java:355) at com.bea.security.saml2.service.sso.SSOServiceProcessor.processAuthnRequest(SSOServiceProcessor.java:160) at com.bea.security.saml2.service.sso.SSOServiceProcessor.process(SSOServiceProcessor.java:100) at com.bea.security.saml2.service.sso.SingleSignOnServiceImpl.process(SingleSignOnServiceImpl.java:50) at