Impossible to create the root directory

I am developing a CRUD, in this same I need to store the img of the users but laravel throws me this error:

  

Impossible to create the root directory

'local' => [
            'driver' => 'local',
            'root' => storage_path('app'),
        ],

public function setImageAdministratorAttribute($imageAdministrator) {
        $name = Carbon::now()->second . $imageAdministrator;
        $this->attributes['imageAdministrator'] = $name;        
        \Storage::disk('local')->put($name, \File::get($imageAdministrator));

    }