the idp security check occued error

Version 1

    when i deploy idp and employee examples in the tomcat ,the error happened!

    an exception or error ocurred in the container during the request processiing.

    java.lang.Illegal Argument Exception:responseType is null...............................

    the idp cound not receive the saml response from the sp.,j_security_check run error.

      help me ,thanks!!