$route config

[eluser]nolaeh[/eluser]
www.mypage.com/welcome/ doenst work.

www.mypage.com/index.php/welcome/ this work..

and the settings in $route is.
$route['welcome'] = "welcome"; (it is the default controller)

I think the problem is that index.php doesnt instanciete. how to get rid of the /index.php/ from the url path?