The eDirectory SSO server needs authentication server, not network objects

I am attempting to set up a new authentication server based on LDAP.  Both tests pass successfully.  When I go to save the config, I get the following error "The eDirectory SSO server needs authentication server, not network objects."  I am not using web protection at all and there are no SSO servers configured.  Any advice on clearing this?  Firmware version: 9.404-5