php - Class not found/loaded in silex -

php - Class not found/loaded in silex -

hello have service in config/config.php

$app['jsonfetcher'] = $app->share(function($app) { homecoming new app\custom\jsonfetcher($app); });

the jsonfetcher in app/custom/jsonfetcher.php

and in composer.json have

"autoload": { "psr-0": { "custom": "app" } }

somehow still error

fatal error: class 'app\custom\jsonfetcher' not found in /users/username/sites/site-demo/config/config.php on line 15

what doing wrong here?

php symfony2 silex