Error exporting Slides from PowerPoint using VB.net

Dim DestFile As String = "c:\temp\"
 
        If Not IO.Directory.Exists(DestFile) Then
            IO.Directory.CreateDirectory(DestFile)
        End If
 
 
        Dim objApp As New PowerPointMe.Application
 
 
 
        objApp.Visible = MsoTriState.msoTrue
        objApp.Presentations.Open(FileStr, MsoTriState.msoFalse, MsoTriState.msoCTrue, MsoTriState.msoCTrue)
        objApp.Assistant.On = False
 
        objApp.Presentations(1).SaveAs(DestFile & "Benefit_" & BenefitID & ".bmp", Microsoft.Office.Interop.PowerPoint.PpSaveAsFileType.ppSaveAsBMP, MsoTriState.msoCTrue)
 
        Dim PresentationByte() As Byte = Nothing
        Dim FileArray(objApp.Presentations(1).Slides.Count - 1) As Object
        Dim i As Integer = 1
 
        For i = 1 To objApp.Presentations(1).Slides.Count
            Dim SlideFileStr As String = DestFile & "Benefit_" & BenefitID & "\Slide" & i & ".bmp"
 
            Dim FS As IO.FileStream = IO.File.Open(SlideFileStr, IO.FileMode.Open)
            ReDim PresentationByte(FS.Length - 1)
            FS.Read(PresentationByte, 0, FS.Length - 1)
 
            FS.Close()
 
            'Save File into array, the array will be saved to the db and pulled back out on the client
            FileArray(i - 1) = PresentationByte
 
        Next
 
        Try
            objApp.ActiveWindow.Close()
        Catch
 
        End Try
        Try
            If objApp.Presentations.Count > 0 Then
                objApp.Presentations(1).Close()
            End If
        Catch ex As Exception
            If Debugger.IsAttached Then Stop
        End Try
        Try
            objApp.Quit()
        Catch ex As Exception
            If Debugger.IsAttached Then Stop
        End Try
 
 
        GC.Collect()
 
        Return ConvertObjectToBytes(FileArray)

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