I am trying to setup saml sp in ubuntu and followed document https://gluu.org/docs/integrate/ubuntu-shib-apache/. when I access sp application, I get below error on browser after successful authentication on gluu server. opensaml::FatalProfileException The system encountered an error at Fri Jan 20 17:54:17 2017 To report this problem, please contact the site administrator at root@localhost. Please include the following message in any email: opensaml::FatalProfileException at (https://sp.example.org/Shibboleth.sso/SAML2/POST-SimpleSign) A valid authentication statement was not found in the incoming message. And /etc/var/shibboleth/shibd.log : 2017-01-20 17:53:52 INFO Shibboleth.AttributeFilter : reload thread started...running when signaled 2017-01-20 17:54:17 ERROR Shibboleth.SSO.SAML2 [2]: failed to decrypt assertion: Unable to resolve any key decryption keys. what could be the issue in this case.