The Router Issue

Dear all,

I have a probelm during development with CI 3.0.0.

In config.php, if I set $config['enable_query_strings'] = TRUE; when I visit my index page that is in localhost website(http://huo.zaiwai.com/vote/) , it has the error:
Unable to determine what should be displayed. A default route has not been specified in the routing file.

But when I set  $config['enable_query_strings'] = FALSE, the problem is resolved however I can't pass the parameter with url.

So how can I resolve this?

Thank you

BR.