使用route php page时，默认控制器无法正常工作

I have a project in this project when my URL

http://host/Bsheet_mvc/

Above is not working

$route['default_controller']        = 'Login';

http://host/Bsheet_mvc/index.php/login

When I use above it its working

This project is made in CI code igniter .

This is case sensitive issue try this

    $route['default_controller'] = 'login';

'l' will be lower case