Error :=Failed to open the connection. Failed to open the connection. Installation Report {A26A9D62-94F6-44A8-A267-89B7518FFB13}.rpt

protected void btn1_Click(object sender, EventArgs e)
    {
ReportDocument cr = new ReportDocument();
        cr.Load(Server.MapPath("~/Installation Report.rpt"));

        TableLogOnInfo logOnInfo = new TableLogOnInfo();
        // I am assuming that you have crystal server database 
        // connection strings in your web.config
        logOnInfo.ConnectionInfo.ServerName = ConfigurationManager.AppSettings["strServer"].ToString();
        logOnInfo.ConnectionInfo.DatabaseName = ConfigurationManager.AppSettings["strDBase"].ToString();
        logOnInfo.ConnectionInfo.UserID = ConfigurationManager.AppSettings["strUID"].ToString();
        logOnInfo.ConnectionInfo.Password = ConfigurationManager.AppSettings["strPWD"].ToString();
        TableLogOnInfo login = default(TableLogOnInfo);
        foreach (CrystalDecisions.CrystalReports.Engine.Table tbl in cr.Database.Tables)
        {
            login = tbl.LogOnInfo;
            login.ConnectionInfo.ServerName = ConfigurationManager.AppSettings["strServer"].ToString();
            login.ConnectionInfo.DatabaseName = ConfigurationManager.AppSettings["strDBase"].ToString();
            login.ConnectionInfo.UserID = ConfigurationManager.AppSettings["strUID"].ToString();
            login.ConnectionInfo.Password = ConfigurationManager.AppSettings["strPWD"].ToString();
            tbl.ApplyLogOnInfo(login);
            Cr1.DataBind();
            cr.SetParameterValue("ASSETID", asstid.Text);
            Cr1.ReportSource = cr;
}