pkg_install version??

[Heungjin Kim <sungkmi%gmail.com@localhost>]

Hi, everybody.

I cannot install binary packages from netbsd ftp. It looks like: 

#pkg_add emacs
pkg_add: Error: package `emacs-24.0.50.20110821' was built with a newer 
pkg_install version

But I've already installed the newest pkg_install (version 20120221). 
What's the problem?? 

Cheers.