How to generate word document in windows server 2003?

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MS-Word

Office-Interop

I had written a function to generate a word document by using the Office Interop Word object. My code is as shown below. It is working fine in my local system. But when i try to run it from window server 2003 it is not working. It keeps loading at Word.Document wordDoc = wordApp.Documents.Open and doesn't do anything.

private void GenerateEmploymentCertificate()
    {
        object Nothing = System.Reflection.Missing.Value;
        object format = Word.WdSaveFormat.wdFormatDocument;
        Word.Application wordApp = new Word.ApplicationClass();

        object srcFileName = Server.MapPath(ResolveUrl(@"~/HRLetter\Arabia\Templates\Employment Certificate.doc"));
        Word.Document wordDoc = wordApp.Documents.Open
       (ref srcFileName, ref format, ref Nothing, ref Nothing,
       ref Nothing, ref Nothing, ref Nothing, ref Nothing, ref Nothing,
       ref Nothing, ref Nothing, ref Nothing, ref Nothing, ref Nothing,
       ref Nothing, ref Nothing);
        try
        {

            object bookmarkDate = "Date";
            wordDoc.Bookmarks.get_Item(ref bookmarkDate).Select();
            wordApp.Selection.Text = string.Format("{0:MM/dd/yyyy}", lblRequestdate.Text);

            object bookmarkEmployeeName = "EmployeeName";
            wordDoc.Bookmarks.get_Item(ref bookmarkEmployeeName).Select();
            wordApp.Selection.Text = lblEmployeeName1.Text;

            object bookmarkCompany = "Company";
            wordDoc.Bookmarks.get_Item(ref bookmarkCompany).Select();
            wordApp.Selection.Text = lblCompanyName1.Text; 

            object bookmarkJoiningDate = "JoiningDate";
            wordDoc.Bookmarks.get_Item(ref bookmarkJoiningDate).Select();
            wordApp.Selection.Text = string.Format("{0:MM/dd/yyyy}", lblJoiningDate1.Text); 

            object bookmarkDesignation = "Designation";
            wordDoc.Bookmarks.get_Item(ref bookmarkDesignation).Select();
            wordApp.Selection.Text = lblDesignation1.Text;

            string DocName;
            DocName = string.Format("{0}_employment_certificate", lblRequestNo.Text);
            hFilename.Value = DocName;
            wordDoc.SaveAs(Server.MapPath(ResolveUrl(@"~/HRLetter\Arabia\Letters\" + DocName + ".doc")));

        }
        catch (Exception exp)
        {
            Session["generalError"] = null;
            Session["generalError"] = "There was an error at generating the letter. Please send email to unify.admin@unilever.com with this screen shot.<br /><br /><br />Request No:" + lblRequestNo.Text + "<br />Action:Submit<br />" + exp.StackTrace.ToString();
            LogManager logHelper = new LogManager(Request.PhysicalApplicationPath.Trim(), "Leave System - Malaysia");
            logHelper.LogError("[btnSubmit_Click - ]" + exp.Message + ".StackTrace - " + exp.StackTrace.ToString());
            Response.Redirect(ResolveUrl("~/Error/ErrorHandler.aspx"));
        }
        finally
        {
            // Close wordDoc2
            wordDoc.Close(ref Nothing, ref Nothing, ref Nothing);
            if (wordDoc != null)
            {
                System.Runtime.InteropServices.Marshal.ReleaseComObject(wordDoc);
                wordDoc = null;
            }
            // close wordApp
            wordApp.Quit(ref Nothing, ref Nothing, ref Nothing);
            if (wordApp != null)
            {
                System.Runtime.InteropServices.Marshal.ReleaseComObject(wordApp);
                wordApp = null;
            }
        }
        GC.Collect();
    }