Returning A Value From SQL

On   cmd.ExecuteNonQuery(); I am getting the following error "Procedure or function usp_Question_Count has too many arguments specified."

Any Ideas as to how to fix this. Oh and I will include the SP down at the bottom

        // Getting the Correct Answer from the Database.
        int QuiziD = Convert.ToInt32(Session["QuizID"]);
        int QuestionID = Convert.ToInt32(Session["QuestionID"]);

        SqlConnection oConn = new SqlConnection("Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\quiz.mdf;Integrated Security=True;User Instance=True");
        SqlCommand cmd = new SqlCommand("usp_Question_Count", oConn);
        cmd.CommandType = CommandType.StoredProcedure;

        SqlParameter QuizParam = new SqlParameter("@QuizId", SqlDbType.Int);
        QuizParam.Value = QuiziD;
        cmd.Parameters.Add(QuizParam);

        SqlParameter QuestionParam = new SqlParameter("@QuestionID", SqlDbType.Int);
        QuestionParam.Value = QuestionID;
        cmd.Parameters.Add(QuestionParam);

        SqlParameter countParam = new SqlParameter("@CorrectAnswer", SqlDbType.Int);
        countParam.Direction = ParameterDirection.Output;
        //cmd.Parameters.Add(workParam);
        cmd.Parameters.Add(countParam);

        oConn.Open();
        cmd.ExecuteNonQuery();
        // get the total number of products
        int iCorrectAnswer = Convert.ToInt32(cmd.Parameters["@CorrectAnswer"].Value);
        oConn.Close();



Heres the stored Procedure


ALTER PROCEDURE dbo.usp_Find_Correct_Answer
     @QuizID int,
     @QuestionID int,
     @CorrectAnswer int OUTPUT
     /*
     (
     @parameter1 int = 5,
     @parameter2 datatype OUTPUT
     )
     */
AS
     /* SET NOCOUNT ON */
     SELECT @CorrectAnswer=CorrectAnswer FROM Question WHERE QuizID=@QuizID AND QuestionOrder=@QuestionID