portmaster with pkgng - deinstall package problem

From the handbook 5.5.1, I installed ports-mgmt/pkg and run pkg2ng, set up make.conf, and reinstall portmaster with pkgng on, it looked perfect. However when I tried to uninstall a package with portmaster -e, it would ask me if I wanted to remove ALL LEAF PACKAGE one by one, everytime.




It is FreeBSD 9.1 by the way.
Code:
jerry@chuchu [pts/1] ~ % uname -a
FreeBSD chuchu 9.1-RELEASE FreeBSD 9.1-RELEASE #0 r243825: Tue Dec  4 09:23:10 UTC 2012     [email]root@farrell.cse.buffalo.edu[/email]:/usr/obj/usr/src/sys/GENERIC  amd64
jerry@chuchu [pts/1] ~ % portmaster --version

===>>> Version 3.14 (pkgng patch 1.6)
jerry@chuchu [pts/1] ~ %
 
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