codeigniter + facebook php sdk URI /?/ sign - how to remove?

[eluser]peter[/eluser]
Hi guys,
after including facebook sdk api into my codeigniter (according to http://jondavidjohn.com/blog/2011/07/usi...odeigniter) I am getting URI links like this http://domain.com/?/welcome. How can I remove question (?) sign from uri?

CI config.php
$config['uri_protocol'] = 'AUTO';
$config['enable_query_strings'] = TRUE;

when I change these configs my links stops working. Any idea how to remove question (?) mark?

[eluser]jegbagus[/eluser]
have you set false to config item "enable_query_strings"?

[eluser]peter[/eluser]
yes I tried it. but with $config[‘enable_query_strings’] = FALSE fb sdk login is not working properly. :{