Erorr in powerpoint viewer

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ASP.NET

HTML

Office-Interop

Hi

i get this error while running my web application

(are you missing an assembly reference?)C:\Documents and Settings\mostafa\My Documents\Visual Studio 2008\search_last\search\App_Code\Office.cs1 33 98 search

and i added

using Microsoft.Office;
using Microsoft.Office.Interop.Word;
using Microsoft.Office.Interop.Excel;
using Visio = Microsoft.Office.Interop.Visio;
using VisioWeb = Microsoft.Office.Interop.Visio.SaveAsWeb;
using PowerPoint = Microsoft.Office.Interop.PowerPoint;

in my Code and add the reference


the error here

presentation = powerPoint.Presentations.Open(refSourceFileName, Microsoft.Office.Core.MsoTriState.msoFalse, Microsoft.Office.Core.MsoTriState.msoFalse, Microsoft.Office.Core.MsoTriState.msoFalse);
               presentation.SaveAs(newRefTargetDirectory, PowerPoint.PpSaveAsFileType.ppSaveAsHTML, Microsoft.Office.Core.MsoTriState.msoCTrue);

what can i do???

Thx