Forum OpenACS Q&A: select table issue

This erro is driving me crazy for two days...
It's a simple select from a table. Please help!!! :(
I created the adp file:

listtemplate name="list-contacts"/listtemplate

the tcl file:
*******************************
ad_page_contract {

Displays a list of available
news items.

@author Iuri Sampaio (mailto:iuri.sampaio@computer.org)
@creation-date 04 Mar 2006
@cvs-id $Id$
}

template::list::create \
-name list-contacts \
-multirow get_contacts \
-key master_contacts__attribute_id \
-elements {
master_contacts__attribute_id {
label "Contact ID"
display_template {
No. @get_contacts.master_contacts_attribute__id@
}
}
master_contacts__attribute_email {
label "Contact Name"
display_template {
a href=mailto:@get_contacts.master_contacts_attribute__id@@get_contacts.master_contacts_attribute__email@/a
}
}
}

db_multirow -extend { } get_contacts get_contacts { } {
}
*****************************************88

and the xql file:
********************************
?xml version="1.0"?
queryset

fullquery name="get_contacts"
querytext
select master_contacts_attribute__email from tbl_master_contacts
/querytext
/fullquery

/queryset
*******************************

here it is the create table script:

********************************************
-- contacts-master-create.sql
--
-- @author Iuri Sampaio mailto:iuri.sampaio@computer.org
-- @creation-date 2006-03-30
-- @cvs-id $Id: contacts-master-create.sql,v 0.1d 2006/03/30 13:50:00 ias Exp $
--
--

create table tbl_master_contacts (
master_contacts_attribute__id integer constraint c_pk primary key,
master_contacts_attribute__first_names varchar(500),
master_contacts_attribute__middle_names varchar(500),
master_contacts_attribute__last_name varchar(500),
master_contacts_attribute__email varchar(500),
master_contacts_attribute__url varchar(500),
master_contacts_attribute__work_phone varchar(500),
master_contacts_attribute__work_fax varchar(500),
master_contacts_attribute__work_mobile_phone varchar(500),
master_contacts_attribute__home_address_municipality varchar(500),
master_contacts_attribute__home_address_region varchar(500),
master_contacts_attribute__home_address_zipcode varchar(500),
master_contacts_attribute__home_address_country varchar(500),
master_contacts_attribute__organization_name varchar(500),
master_contacts_attribute__organization_address_municipality varchar(500),
master_contacts_attribute__organization_address_region varchar(500),
master_contacts_attribute__organization_address_zipcode varchar(500),
master_contacts_attribute__organization_address_country varchar(500),
master_contacts_attribute__organization_type varchar(500),
master_contacts_attribute__organization_interest varchar(500),
master_contacts_attribute__organization_size varchar(500)
);

*****************************************

then i got stuck on the error message:
********************************************8
There was a server error processing your request. We apologize.

Take me back where I was (before the error)
Database operation "select" failed (exception NSDB, "Query was not a statement returning rows.")

SQL:
while executing
"ns_pg_bind select nsdb0 { }"
("uplevel" body line 1)
invoked from within
"uplevel $ulevel [list ns_pg_bind $type $db $sql]"
("postgresql" arm line 2)
invoked from within
"switch $driverkey {
oracle {
return [uplevel $ulevel [list ns_ora $type $db $sql] $args]
}
..."
invoked from within
"db_exec select $db $full_statement_name $sql"
invoked from within
"set selection [db_exec select $db $full_statement_name $sql]"
("uplevel" body line 2)
invoked from within
"uplevel 1 $code_block "
invoked from within
"db_with_handle -dbn $dbn db {
set selection [db_exec select $db $full_statement_name $sql]
set local_counter 0

# Make sure 'n..."
(procedure "db_multirow" line 40)
invoked from within
"db_multirow -extend { } get_contacts get_contacts { } {
}"
("uplevel" body line 30)
invoked from within
"uplevel {
ad_page_contract {

Displays a list of available
news items.

@author Iuri Sampaio (mailto:iuri.sampaio@computer.org)
@creat..."
(procedure "code::tcl::/var/lib/aolserver/yabt/packages/master-contacts/..." line 2)
invoked from within
"code::tcl::$__adp_stub"
invoked from within
"if { [file exists $__adp_stub.tcl] } {

# ensure that data source preparation procedure exists and is up-to-date
adp_init tcl $__adp_stub
..."
("uplevel" body line 3)
invoked from within
"uplevel {

if { [file exists $__adp_stub.tcl] } {

# ensure that data source preparation procedure exists and is up-to-date
adp_init t..."
(procedure "adp_prepare" line 2)
invoked from within
"adp_prepare "
(procedure "template::adp_parse" line 30)
invoked from within
"template::adp_parse [file root [ad_conn file]] {}"
(procedure "adp_parse_ad_conn_file" line 5)
invoked from within
"$handler"
("uplevel" body line 2)
invoked from within
"uplevel $code"
invoked from within
"ad_try {
$handler
} ad_script_abort val {
# do nothing
}"
invoked from within
"rp_serve_concrete_file [ad_conn file]"
(procedure "rp_serve_abstract_file" line 60)
invoked from within
"rp_serve_abstract_file "$root/$path""
("uplevel" body line 2)
invoked from within
"uplevel $code"
invoked from within
"ad_try {
rp_serve_abstract_file "$root/$path"
set tcl_url2file([ad_conn url]) [ad_conn file]
set tcl_url2path_info..."