Laravel 5.2 ServiceProvider 中无法使用 Cache

namespace App\Providers;
use Illuminate\Support\ServiceProvider;
use Cache;
use App;
use View;
class GlobalProvider extends ServiceProvider
{

public function boot()
{
    //
}

public function register()
{
    //
    $this->app->singleton('g_names', function(){
        return Cache::get('names');
    });
    View::share('g_names', App::make('g_names'));
}

}

FatalThrowableError in Facade.php line 218:
Fatal error: Call to undefined method Illuminate\Support\Facades\Cache::get()
in Facade.php line 218
at Facade::__callStatic('get', array('names')) in GlobalProvider.php line 19
at GlobalProvider->App\Providers{closure}(object(Application), array()) in Container.php line 735