ASP RenderDocumentToFile: Blank images !

Hi,

I started a sript witch have to make an image with every page of a uploaded PDF, but the generated images are always blank !!! Can you help me ?

Here is my code :

      'Path to the file
      FichierCatalogue = "c:/upload/myFile.pdf"

      'Creating QuickPDF Object
      Dim QP
      Set QP = Server.CreateObject("iSED.QuickPDF")
      Call QP.UnlockKey(PDFLicence)

      'Opening the PDF
      QP.LoadFromFile(FichierCatalogue)

      'Rendering the images
      QP.RenderDocumentToFile(72, 1, QP.PageCount, 1, Server.MapPath("/upload/") & "/page-.jpg")=0

I also tried with GetPagePreview, RenderPageToString and i still have each page as a blank jpeg... Help !!!

Regards,
Antoine