joomla 1.6 - Access denied for user ''@'localhost'

I´m trying to reproduce external script example Type #2 in joomla 1.6.

In my article i put:
{tbs}script=cuentas.php; {/tbs}

Name                        Email
[u.name;block=tr]  [u.email]


and generate the script cuentas.php:
<?php
$key =  JFactory::getUser();
$key = $key-> get('id');

$TBS->MergeBlock('u','mysql','SELECT name, email FROM jos_users WHERE id='.$key);
?

But when i access the article i got the error message:
"TinyButStrong Error when merging block [u]: MySql error message when opening the query: Access denied for user ''@'localhost' (using password: NO)"

How may i correct the error ??

Someone may help me....

Thanks in advance

Hi JB,

Try by replacing 'mysql' with 'mysqli'.

Thank you Skrol29. It didnt work. It produces the following error messge:
TinyButStrong functions for MySQLi: . SQL Source : {SELECT name, email FROM jos_users WHERE id=43}

TinyButStrong Error when merging block [u]: function tbsdb_mysqli_open() has failed to open query {SELECT name, email FROM jos_users WHERE id=43}

But I remembered that in the set up (Global Configuration, server, Databasetype) I changed MySQL by MySQLi. I Reverse the chage (to MySQL) ánd all it is working fine.

Thanks again.

JB