Hello Sandy Zhang,
only this release (in Post
138651 in reply to
138584) and this before (in Post
138533 in reply to
138393) are trying to access the Device D.
By the way your hotfix from Ticket http://www.aspose.com/community/forums/130890/aspose-pdf-in-java-footer-won-t-work-pagenumber-lastpagenumber-on-a-section-with-two-pages/showthread.aspx#130890 is also trying to access the device D.
Try it on a system without a device d you will see.
sincerly
Vland