“Ruta [inicio de sesión] no definida.” Código de respuesta

Ruta [inicio de sesión] no definida.

You're trying to redirect to a named route whose name is login, but you have
no routes with that name:

Route::post('login', [ 'as' => 'login', 'uses' => 'LoginController@do']);

The 'as' portion of the second parameter defines the name of the route. The 
first string parameter defines its route.