调用oracle存储过程，报错


OracleParameter[] ps = new OracleParameter[]{new OracleParameter("v_flowid",OracleType.VarChar,2,ParameterDirection.Input,true,0,0,"",DataRowVersion.Default,m_DBNull),
            new System.Data.OracleClient.OracleParameter("V_CURSOR", System.Data.OracleClient.OracleType.Cursor, 255, System.Data.ParameterDirection.Output, true, 0, 0, "", System.Data.DataRowVersion.Default, this.m_DBNull)};
            ps[0].Value = v_flowid;
            try
            {
                ds = BLL.OracleHelper.ExecuteDataset(this.m_connectionString, System.Data.CommandType.StoredProcedure, "scott.GETYHLIST", ps);
            }
调用oracle存储过程，报错 24338 未执行语句句柄CREATE OR REPLACE PROCEDURE GETYHLIST(v_flowid INTEGER,v_cursor OUT sys_refcursor)
IS
v_count NUMBER;
BEGIN
            SELECT COUNT(*)
              INTO v_count
              FROM yh_flowdetail
             WHERE yhflowid <> 3;
             IF v_count > 0 THEN
               OPEN v_cursor FOR 
             SELECT yfl.yhid,
                    yfl.title,
                    yfl.createtime,
                    yf.flowname，  
                    ylr.layername,
                    yr.regionname,
                    yfl.cleartime,
                    yfl.yhdescribe
               FROM yh_flowdetail yfl,
                    yh_flowname   yf,
                    yh_layer      ylr,
                    yh_level      yll,
                    yh_region     yr
              WHERE 1 = 1
                AND yfl.yhflowid = yf.flowid(+)
                AND yfl.regionid = yr.regionid(+)
                AND yfl.yhlayerid = ylr.layerid(+)
                AND yfl.yhleverid = yll.levelid(+)
                AND yfl.yhflowid = v_flowid;
           RETURN;
           END IF;
END;
数据库能够连上，但是执行的时候，就报错了。。