php - Symfony/Silex SecurityServiceProvider: Serialization of 'Closure' is not allowed -

i follow [silex securityserviceprovider][1]

[1]: http://silex.sensiolabs.org/doc/providers/security.html step step, when submit login form, got error:

exception in abstracttoken.php line 154: serialization of 'closure' not allowed 

i don't know error comes from... use same code exemple:

controller:

$app->get('/login', function(request $request) use ($app) {     return $app['twig']->render('login.twig', array(         'error'         => $app['security.last_error']($request),         'last_username' => $app['session']->get('_security.last_username'),     )); }); 

view:

<form action="{{ path('connexion') }}" method="post">     {{ error }}     <input type="text" name="_username" value="{{ last_username }}" />     <input type="password" name="_password" value="" />     <input type="submit" /> </form> 

the first lines of error:

 in abstracttoken.php line 154 @ splobjectstorage->serialize() @ serialize(array(object(user), true, array(object(role)), array())) in abstracttoken.php line 154 @ abstracttoken->serialize() in usernamepasswordtoken.php line 96 @ usernamepasswordtoken->serialize() @ serialize(object(usernamepasswordtoken)) in contextlistener.php line 129 @ contextlistener->onkernelresponse(object(filterresponseevent), 'kernel.response', object(traceableeventdispatcher)) @ call_user_func(array(object(contextlistener), 'onkernelresponse'), object(filterresponseevent), 'kernel.response', object(traceableeventdispatcher)) in wrappedlistener.php line 61 @ wrappedlistener->__invoke(object(filterresponseevent), 'kernel.response', object(eventdispatcher)) @ call_user_func(object(wrappedlistener), object(filterresponseevent), 'kernel.response', object(eventdispatcher)) in eventdispatcher.php line 174 

thanks help

i solved problem implements \serializable.

class user extends entity implements userinterface, \serializable { 

according doc

http://symfony.com/doc/current/cookbook/security/entity_provider.html