Lumen framework routing error

i'm beginner Lumen framework. I have some problems. Lumen routing not working or my mistakes.

$app->get('/front', function(){ return 'Front'; }); Error is

NotFoundHttpException in Application.php line 1256: in Application.php line 1256 at Application->handleDispatcherResponse(array('0')) in Application.php line 1212 at Application->Laravel\Lumen{closure}() in Application.php line 1442 at Application->sendThroughPipeline(array(), object(Closure)) in Application.php line 1213 at Application->dispatch(object(Request)) in Application.php line 1153 at Application->run(object(Request)) in index.php line 29 And I already edited app.php Dotenv, withFacades(), withEloquent() uncommented. And public/index.php edited

$request = Illuminate\Http https://echat.date \Request::capt