Problem with simple route

hi , hi have this routes (part of routes ) :

Code:

$routes->get('/operatori','Operatori_Articoli::lista_completa');



$routes->group('operatori_Articoli'/*, ['filter' => 'adminFiltersAuth']*/, function($routes) {

$routes->get('lista_completa', 'Operatori_Articoli::lista_completa');
    $routes->post('ricerca_o_Inserisci', 'Operatori_Articoli::ricerca_o_Inserisci');


});

If i write on browser :
https://my_site/my_subdomain/operatori 
i have Controller or its method is not found: \App\Controllers\Operatori_Articoli::lista_completa
If i write on browser :
https://my_site/my_subdomain/operatori_A...a_completa 
it work fine .
What's wrong  in my route  ?