msgfmt plural error in gnome-applets

[pclouds <pclouds users sourceforge net>]

Hi,
I'm translating gnome-applets.
When i use msgfmt to check, it showed:
msgfmt --statistics -c -v -o /dev/null /home/pclouds/downloads/new/n/gnome-applets.HEAD.vi.po
/home/pclouds/downloads/new/n/gnome-applets.HEAD.vi.po:5323: message catalog has plural form translations...
/home/pclouds/downloads/new/n/gnome-applets.HEAD.vi.po:6: ...but header entry lacks a "plural=EXPRESSION" attribute
/home/pclouds/downloads/new/n/gnome-applets.HEAD.vi.po:5323: message catalog has plural form translations...
/home/pclouds/downloads/new/n/gnome-applets.HEAD.vi.po:6: ...but header entry lacks a "nplurals=INTEGER" attribute

Below is at the line 5315:

#: stickynotes/stickynotes_applet.c:338
#, c-format
msgid ""
"%s\n"
"%d note"
msgid_plural ""
"%s\n"
"%d notes"

Did i do anything wrong?

-- 
Bi Cờ Lao