CI controller function is ignored

[eluser]den-javamaniac[/eluser]
Well, I get a very strange error:

If routes are not set (some default value is not assigned) like this:

Code:

$route['default_controller'] = "";
$route['scaffolding_trigger'] = "";

I can't get to any controller (I've created another one for testing) - it prints out an

Code:

"Unable to determine what should be displayed. A default route has not been specified in the routing file."

error. So this looks like I can only get to some predefined controller index method. Is it possible that some php installation module/param/etc was not defined or alike?