What the @#X#% it wants!!!

I have a form with two Wang controls, imgAdminist and imgEdit1. imgAdminist is a control variable defined in a standard module. It works because the image is diplayed. however when it comes to replace a page into a TIF file it gives me error 753: Cannot create temporary file necessary to save.
This is the code:

imgAdminist.Replace imgEdit1.Image, imgEdit1.Page, ImgEdit1.Page, 1



The sintax for replace is:
object.replace source,sourcePage,DestinationPage,NumPages

What does it mean, and how can I solve the problem?

Please help me
ivan