[Koha] no valid OpenPGP data

Hi, I am using Debian 6.0.1 Fellow instruction at http://wiki.koha-community.org/wiki/Koha_3.2_on_Debian_Squeeze Add this line deb http://debian.koha-community.org/koha squeeze main at the end of this file /etc/apt/sources.list. deb http://debian.koha-community.org/koha squeeze main and, execute this command from terminal wget -o- http://debian.koha-community.org/koha/gpg.asc | sudo apt-key add - Return with fellowing message: gpg: no valid OpenPGP data. Question: What wrong it would be? How to correct them? Wishing you all the best. . . . Anthony Mao