尝试登录Cakephp应用程序时，我遇到了以下错误。
Warning (512): _cake_model_ cache was unable to write 'default_ticketing_tickets' to Apc cache [CORE/Cake/Cache/Cache.php, line 306]
这发生在随机的场合，我找不到原因。
我已将tmp文件夹，文件和子文件夹启用为777
还有什么我需要做的，因为它还没有用吗？
这是在Cent OS服务器上
更新 以下是我在错误信息下收到的信息。
Cache::write() - CORE/Cake/Cache/Cache.php, line 306
DataSource::_cacheDescription() - CORE/Cake/Model/Datasource/DataSource.php, line 306
Mysql::describe() - CORE/Cake/Model/Datasource/Database/Mysql.php, line 334
Model::schema() - CORE/Cake/Model/Model.php, line 1281
FormHelper::_introspectModel() - /home/commstrat2_web/html/roadconference/lib/Cake/View/Helper/FormHelper.php, line 191
FormHelper::create() - /home/commstrat2_web/html/roadconference/lib/Cake/View/Helper/FormHelper.php, line 444
include - APP/View/Users/login.ctp, line 3
View::_evaluate() - /home/commstrat2_web/html/roadconference/lib/Cake/View/View.php, line 908
View::_render() - /home/commstrat2_web/html/roadconference/lib/Cake/View/View.php, line 872
View::render() - /home/commstrat2_web/html/roadconference/lib/Cake/View/View.php, line 463
Controller::render() - /home/commstrat2_web/html/roadconference/lib/Cake/Controller/Controller.php, line 962
Dispatcher::_invoke() - /home/commstrat2_web/html/roadconference/lib/Cake/Routing/Dispatcher.php, line 110
Dispatcher::dispatch() - /home/commstrat2_web/html/roadconference/lib/Cake/Routing/Dispatcher.php, line 85
[main] - APP/webroot/index.php, line 96