SSO: Canonicalization algorithm (http://www.w3.org/TR/2001/REC-xml-c14n-20010315) from Authn Request is not supported

Hi, our IDP does not accept SAML requests from an external SP   logs warning tmm1[19205]: 014d1502:4: /Common/SSO-V2:Common:a0ed343f:SAML SSO: Canonicalization algorithm (http://www.w3.org/TR/2...