Error in export data from GridView to Excel By Component (VS2010 – C#)

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ASP.NET4

Hi
For export data from GridView to Excel By Component, I use from below commands:

System.Globalization.CultureInfo oldCI = System.Threading.Thread.CurrentThread.CurrentCulture;
        System.Threading.Thread.CurrentThread.CurrentCulture = new System.Globalization.CultureInfo("en-US");
        Microsoft.Office.Interop.Excel.Application excelApp = new Microsoft.Office.Interop.Excel.Application();
        Microsoft.Office.Interop.Excel.Workbook excelWorkBook = excelApp.Workbooks.Add(XlSheetType.xlWorksheet);
        Microsoft.Office.Interop.Excel.Worksheet excelWorkSheet = (Worksheet)excelWorkBook.Worksheets[1];
        excelWorkSheet.DisplayRightToLeft = true;
        int ClmCount = GridView1.Columns.Count;
        Range[] rng = new Range[ClmCount];

        for (int i = 0; i < ClmCount; i++)
        {
            string CellAddress = Convert.ToString(Convert.ToChar(Convert.ToByte(i + 65))) + "1";
            rng[i] = excelWorkSheet.get_Range(CellAddress, CellAddress);
            rng[i].Value2 = GridView1.Columns[i].HeaderText;
        }

        int j = 2;
        foreach (GridViewRow grdr in GridView1.Rows)
        {
            for (int k = 0; k < ClmCount; k++)
            {
                string CellAddress = Convert.ToString(Convert.ToChar(Convert.ToByte(k + 65))) + j.ToString();
                rng[k] = excelWorkSheet.get_Range(CellAddress, CellAddress);
                rng[k].Value2 = grdr.Cells[k].Text.ToString();
            }
            j++;
        }

        excelApp.Visible = true;

but after publish and run my web site , I will be faced with this error:

Retrieving the COM class factory for component with CLSID {00024500-0000-0000-C000-000000000046} failed due to the following error: 80040154 Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG)). 
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.Runtime.InteropServices.COMException: Retrieving the COM class factory for component with CLSID {00024500-0000-0000-C000-000000000046} failed due to the following error: 80040154 Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG)).

Source Error: 
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below. 

Stack Trace: 
[COMException (0x80040154): Retrieving the COM class factory for component with CLSID {00024500-0000-0000-C000-000000000046} failed due to the following error: 80040154 Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG)).]
   rl_allusers_Rep_cpdbc_2.send_to_Excel_by_Component2_Click(Object sender, EventArgs e) +100
   System.Web.UI.WebControls.Button.OnClick(EventArgs e) +118
   System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +112
   System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +10
   System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13
   System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +36
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +5563

________________________________________
Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.1 
Thanks very much