ErrorException in UrlGenerator.php line 304: Route [login] not defined. (View: E:\xampp\htdocs\school\resources\views\login.blade.php)

hello i am just start on laravel . i found ErrorException in UrlGenerator.php line 304: Route [login] not defined. (View: E:\xampp\htdocs\school\resources\views\login.blade.php) error what can i do

Route::get('/' , ['as' => '/', 'uses' => 'LoginController@getlogin']); Route::post('/Login', ['as'=> 'Login' , 'uses' => 'LoginController@postLogin' ]);

Route::group(['middleware'=>['authen','roles' ]], function(){
Route::get('/logout' , ['as' => 'logout' , 'uses'=> 'LoginController@getLogout']); Route::get('/dashboard',['as'=> 'dashboard', 'uses'=> 'DashboardController@dashboard']); });

via Chebli Mohamed