Query Bindings Problem

What do you see when, on a query you know will fail, you use

PHP Code:

echo $this->db->error(); 


after

I get the next message:

Unsupported feature of the database platform you are using.
Filename: <project>/system/database/drivers/pdo/subdrivers/pdo_odbc_driver.php
Line Number: 171

The line contains a public funcion _escape_str($str), if I comment, the query work's perfectly!!