Persist ASP Upload hjælp

jeg har

If request.querystring("upload") = "ok" then
   
Set Upload = Server.CreateObject("Persits.Upload")


Upload.Save "E:\Kunder\www.danlast.dk\test\Trucks\images\trucks\temp"


Set File1 = Upload.form("File1")

Set Str_ImageNr = Upload.form("Img")

Set Str_ID = Upload.form("ID")


        If Str_ID = "Billed" then
        TempImg = "Billed"
        ElseIf Str_ID = "Billed2" then
        TempImg = "Billed2"
        End If

If Not File1 Is Nothing Then
       
                If File1.ImageType = "UNKNOWN" Then
               
                        If Err.Number = 8 Then
                        File1.Delete           
                        End IF   
               
                ' Copy file 1
                File1.Copy "E:\Kunder\www.danlast.dk\test\Trucks\images\trucks"& File1.Filename
                ' Delete from temp folder
                File1.Delete
               
                else
               
                File1.Delete
               
                Response.write "Fil type wrong"
               
                end if
       
        End if


End if


Hvergang jeg forsøger at uploade en fil får jeg fejlen

Microsoft VBScript runtime error '800a01b6'

Object doesn't support this property or method: 'File1.ImageType'

/Trucks/upload_image.asp, line 40


Linie 40 er
If File1.ImageType = "UNKNOWN" Then

men i dokumentationen står der:

ImageType As String (Read-Only)
Returns the image type. Possible return values are "BMP", "GIF", "JPG", "PNG" for BMP, GIF, JPEG and PNG images, respectively, and "UNKNOWN" if the file is not an image or of an unknown image type.
Usage:

Response.Write File.ImageType


så hvorfor virker det ikke ??