Help with facebook.el

[Exal de Jesus Garcia Carrillo]

Hi, does anyone use facebook.el?, I'm getting the following error when
I try the M-x facebook-login:


,----
| Wrong type argument: characterp, (request_args . [((value .
"d33a5eafc72c6324576c1bd1319910a21") (key . "sig")) ((value . "") (key
|."api_key")) ((value . \"1978692874445\
| 856") (key . "call_id")) ((value . "JSON") (key . "format"))
((value . "auth.createToken") (key . "method")) ((value . "1.0")
(key . "v"))])
`----

(I have loaded json.el also)

I'm using emacs 23 on a debian lenny box

any hint or advice will be really appreciated


thanks, Exal