help ~ emacs can't read news group

[invokey]

hi,all,
When I was under the server mode (^), I can saw

     {nnfolder:archive} (opened)
     {nndraft:} (opened)
     {nnfolder:} (opened)
     {nntp:freenews.netfront.net} (opened)

Then, I enter the last line, emacs shows..

      gnus read: 3000k

When it was done, emacs reported...

      Wrong type argument: stringp, ("0.test" . 187)

I googled a while, and found not good answer for this error,
can anybody tells me what's going on?


This is my .gnus.el:

;;;;;;;;;;;;;;;;;;;;;;;;;;; .gnus.el ;;;;;;;;;;;;;;;;;;;;;;;
;; nntp server
(setq gnus-select-method '(nntp "freenews.netfront.net"))


;; POP3 server
(setq mail-sources
'((pop :server "pop.163.com" ;; your pop3 server
:user "invoeky" ;; username
:port "pop3"
:password "invokey"))) ;;
(setq mew-pop-delete nil)

;; SMTP server
(setq gnus-secondary-select-methods '((nnfolder "")))
(setq user-full-name "biozhang") ;;
(setq user-mail-address "invokey@163.com") ;;
(setq smtpmail-auth-credentials
'(("smtp.163.com" ;; SMTP server
25
"invokey" ;;
"invokey"))) ;;
(setq smtpmail-default-smtp-server "smtp.163.com")
(setq smtpmail-smtp-server "smtp.163.com")
(setq message-send-mail-function 'smtpmail-send-it)

;; for chinese symbo
(set-language-environment 'Chinese-GB)
(setq gnus-default-charset 'chinese-iso-8bit
gnus-group-name-charset-group-alist '((".*" . chinese-iso-8bit))
gnus-summary-show-article-charset-alist
'((1 . chinese-iso-8bit)
(2 . gbk)
(3 . big5)
(4 . utf-8))
gnus-newsgroup-ignored-charsets
'(unknown-8bit x-unknown iso-8859-1))


;; for html mail
(eval-after-load "mm-decode"
'(progn
(add-to-list 'mm-discouraged-alternatives "text/html")
(add-to-list 'mm-discouraged-alternatives "text/richtext")))


(add-hook 'gnus-group-mode-hook 'gnus-topic-mode)


;; subcribed newsgroups
;;(setq gnus-default-subscribed-newsgroups
;;'("sci.bio.misc"
;;"bionet.general"
;;"bionet.jobs"
;;"alt.bio.technology"))

(setq gnus-fatch-groups
' "bionet.jobs"
)

;;;;;;;;;;;;;;;;;;;;;;;; end of .guns.el ;;;;;;;;;;;;;;;;;;

Thanks a lot,

invokey.