C#调用Oracle Function 报非法变量名/编号

public string Test()
        {
            try
            {
                Open();
                OracleCommand cmd = new OracleCommand("htfcrm2.htf_insertsms", con);
                cmd.CommandType = CommandType.StoredProcedure;
                OracleParameter p1 = new OracleParameter("p_MOBILE", OracleType.Char, 40);
                p1.Direction = System.Data.ParameterDirection.Input;
                p1.Value = "12312341234";
                OracleParameter p2 = new OracleParameter("p_CONTENT", OracleType.Char, 2000);
                p2.Direction = System.Data.ParameterDirection.Input;
                p2.Value = "测试";
                OracleParameter p3 = new OracleParameter("p_priority", OracleType.Char, 1);
                p3.Direction = System.Data.ParameterDirection.Input;
                p3.Value = "1";
                OracleParameter p4 = new OracleParameter("p_custname", OracleType.Char, 60);
                p4.Direction = System.Data.ParameterDirection.Input;
                //p4.Value = "";
                OracleParameter p5 = new OracleParameter("p_sysname", OracleType.Number, 20);
                p5.Direction = System.Data.ParameterDirection.Input;
                p5.Value = 4;
                OracleParameter p6 = new OracleParameter("p_limitDateS", OracleType.Char, 10);
                p6.Direction = System.Data.ParameterDirection.Input;
                p6.Value = "2011-03-01";
                OracleParameter p7 = new OracleParameter("p_limitDateE", OracleType.Char, 10);
                p7.Direction = System.Data.ParameterDirection.Input;
                p7.Value = "2011-03-01";
                OracleParameter p8 = new OracleParameter("p_LIMMITTIMES", OracleType.Number, 4);
                p8.Direction = System.Data.ParameterDirection.Input;
                p8.Value = 100;
                OracleParameter p9 = new OracleParameter("p_LIMMITTIMEE", OracleType.Number, 4);
                p9.Direction = System.Data.ParameterDirection.Input;
                p9.Value = 1439;
                OracleParameter p10 = new OracleParameter("p_maxLength", OracleType.Number, 3);
                p10.Direction = System.Data.ParameterDirection.Input;
                p10.Value = 70;
                OracleParameter p11 = new OracleParameter("p_custno", OracleType.Char, 40);
                p11.Direction = System.Data.ParameterDirection.Input;
                //p11.Value = "";
                OracleParameter p12 = new OracleParameter("p_custSrcSys", OracleType.Char, 40);
                p12.Direction = System.Data.ParameterDirection.Input;
                //p12.Value = "";
                OracleParameter p13 = new OracleParameter("p_filterHe", OracleType.Char, 1);
                p13.Direction = System.Data.ParameterDirection.Input;
                //p13.Value = "";
                OracleParameter p14 = new OracleParameter("p_filterUnsmsUser", OracleType.Char, 1);
                p14.Direction = System.Data.ParameterDirection.Input;
                //p14.Value = "";
                OracleParameter p15 = new OracleParameter("p_filterUmsmsMobile", OracleType.Char, 1);
                p15.Direction = System.Data.ParameterDirection.Input;
                //p15.Value = "";
                OracleParameter p16 = new OracleParameter("p_out ", OracleType.Char, 200);
                p16.Direction = System.Data.ParameterDirection.ReturnValue;
                p16.Value = "";                cmd.Parameters.Add(p1);
                cmd.Parameters.Add(p2);
                cmd.Parameters.Add(p3);
                cmd.Parameters.Add(p4);
                cmd.Parameters.Add(p5);
                cmd.Parameters.Add(p6);
                cmd.Parameters.Add(p7);
                cmd.Parameters.Add(p8);
                cmd.Parameters.Add(p9);
                cmd.Parameters.Add(p10);
                cmd.Parameters.Add(p11);
                cmd.Parameters.Add(p12);
                cmd.Parameters.Add(p13);
                cmd.Parameters.Add(p14);
                cmd.Parameters.Add(p15);
                cmd.Parameters.Add(p16);                cmd.ExecuteNonQuery();                return p16.Value.ToString();            }
参数名可以确保没有问题...   到底是哪出错了？
求解...