Authenticate Error On MOD_AUTH_PGSQL.C

Dear Sir,

I'm administrator in
Posqgressql 6.3.2 + Linux 2.0.30 for Intel + Apache1.2.6 and mod_auth_pgsql.c

Authetication Error when after input the UserName and Password of
Basic Authentication Dialog.

AuthenticateFail or Internal Server Error.

Please Suggest me my problem?

Hhere is My configuration to
ACCESS.CONF of Apache1.2.6 and Postgresql 6.3.2 created table.

ACCESS control for mod_auth_pgsql.(ACCESS.CONF)

<DIRECTORY /usr/local/etc/httpd/htdocs/ext>
Auth_PGhost localhost
Auth_PGport 5432
Auth_PGdatabase mgtstaff
Auth_PGpwd_table valid_users
Auth_PGuid_field user
Auth_pGpwd_field passsword
AuthName My Postgres95 Authenticator
AuthType basic
<LIMIT GET POST>
require valid-user
</LIMIT>
</DIRECTORY>

On the DB "mgtstaff"
create table valid_users
(
user varchar(8),
password varchar(8),
gruop　varchar(30)
);

And ready to reacord on field user and field passsword with
both string 'guest'.
---------------------------------------------
Koujiro Iuchi
System Administrator
yano Electric Co.,Ltd.
email: iuchi(at)yano-el(dot)co(dot)jp