hello hi..what does this error means?

josh
using System.Xml;
using OWC;
using System.Runtime.InteropServices;
public partial class BSE : System.Web.UI.Page
{
SqlConnection con = new SqlConnection(ConfigurationManager.AppSettings["connection"]);
protected void Page_Load(object sender, EventArgs e)
{
con.Open();
SqlDataAdapter sda = new SqlDataAdapter("select * from BSE", con);
DataSet ds = new DataSet();
sda.Fill(ds);
con.Close();
for (int j = 0; j < ds.Tables[0].Rows.Count; j++)
{
Label1.Text = ds.Tables[0].Rows[j]["aban_offshore"].ToString();
Label2.Text = ds.Tables[0].Rows[j]["ABB"].ToString();
Label3.Text = ds.Tables[0].Rows[j]["ACC"].ToString();
Label4.Text = ds.Tables[0].Rows[j]["Adani_enter"].ToString();
Label5.Text = ds.Tables[0].Rows[j]["Aditya_Birla_Nuvo"].ToString();
Label6.Text = ds.Tables[0].Rows[j]["Allahabad_Bank"].ToString();
Label7.Text = ds.Tables[0].Rows[j]["Ambuja_Cement"].ToString();
Label8.Text = ds.Tables[0].Rows[j]["Andhra_Bank"].ToString();
Label9.Text = ds.Tables[0].Rows[j]["Appollo_Hospital"].ToString();
Label10.Text = ds.Tables[0].Rows[j]["Areva_T_and_D"].ToString();
}
//////////////////////////////////////////////////////////

con.Open();
DataSet ds1 = new DataSet();
SqlDataAdapter da = new SqlDataAdapter("select dates, closes from BSEagg", con);
da.Fill(ds1);

ChartSpaceClass oChartSpace = new ChartSpaceClass();




System.IO.StringWriter sw = new System.IO.StringWriter();
XmlDocument xDoc = new XmlDocument();
ds1.WriteXml(sw);
// clean up
con.Close();
da.Dispose();
ds1.Dispose();
xDoc.LoadXml(sw.ToString());
sw.Close();
System.Xml.XmlNodeList nodes;
nodes = xDoc.ChildNodes.Item(0).ChildNodes;
int nCount = nodes.Count;
string[] aNames = new string[nCount];
string[] aTotals = new string[nCount];
string names = String.Empty;
string totals = String.Empty;
int i = 0;
for (i = 0; i < nCount; i++)
{
aNames[i] = nodes.Item(i).ChildNodes.Item(0).InnerText;
aTotals[i] = nodes.Item(i).ChildNodes.Item(1).InnerText;
}
try
{
names = String.Join("\t", aNames);
totals = String.Join("\t", aTotals);
oChartSpace.Charts.Add(0);
oChartSpace.Charts[0].SeriesCollection.Add(0);
oChartSpace.Charts[0].SeriesCollection[0].SetData(OWC.ChartDimensionsEnum.chDimCategories,
Convert.ToInt32(OWC.ChartSpecialDataSourcesEnum.chDataLiteral), names);
oChartSpace.Charts[0].SeriesCollection[0].SetData(OWC.ChartDimensionsEnum.chDimValues,
Convert.ToInt32(OWC.ChartSpecialDataSourcesEnum.chDataLiteral), totals);
string strFullPathAndName = Server.MapPath("~/graph/" + System.DateTime.Now.Ticks.ToString() + ".gif");
oChartSpace.ExportPicture(strFullPathAndName, "gif", 800, 600);
string[] arr = new string[] { };
arr = strFullPathAndName.Split('\\');
Panel1.Visible = true;
Image3.Visible = true;
Image3.ImageUrl = "~/" + arr[arr.Length - 2] + "/" + arr[arr.Length - 1];
}
catch (Exception ex)
{

throw;
}

}
}

can any body view this code