winForm里水晶报表加载失败

求指点。。

private void Form_PushReport_Load(object sender, EventArgs e)

        {

            SqlConnection conn = DBConnection.MyConnection();

            conn.Open();



            try

            {

                string sql = "SELECT * FROM "+table;//table是表的名字的字符串

                SqlDataAdapter sda = new SqlDataAdapter(sql, conn);

                DataSet ds = new DataSet();

                sda.Fill(ds, "tmpTable");

                string reportPath = System.Windows.Forms.Application.StartupPath + @"CrystalReport_Push.rpt";

                ReportDocument rd = new ReportDocument();

                rd.Load(reportPath);

                rd.SetDataSource(ds.Tables[0].DefaultView);

                this.crystalReportViewer1.ReportSource = rd;

            }

            catch (Exception ex)

            {

                throw new Exception(ex.Message.ToString());//一直抛出异常，提示报表加载失败

            }

            finally

            {

                conn.Close();

            }

       }

ReportDocument rd = new ReportDocument(); 原先这里提示未引用，然后我加了using CrystalDecisions.CrystalReports.Engine;这里没错误了，可运行时抛出异常，加载失败