Symfony2.2无法运行作曲者更新

Question

从今天上午开始，我无法在Symfony中更新我的供应商软件包。我收到以下错误：

PHP Fatal error: Class 'Composer\Script\PackageEvent' not found in phar:///var/bean/deploy/qa/2013-06-03/api/composer.phar/src/Composer/Script/EventDispatcher.php on line 78 
PHP Stack trace: 
PHP 1. {main}() /var/bean/deploy/qa/2013-06-03/api/composer.phar:0 
PHP 2. require() /var/bean/deploy/qa/2013-06-03/api/composer.phar:15 
PHP 3. Composer\Console\Application->run() phar:///var/bean/deploy/qa/2013-06-03/api/composer.phar/bin/composer:43 
PHP 4. Symfony\Component\Console\Application->run() phar:///var/bean/deploy/qa/2013-06-03/api/composer.phar/src/Composer/Console/Application.php:83 
PHP 5. Composer\Console\Application->doRun() phar:///var/bean/deploy/qa/2013-06-03/api/composer.phar/vendor/symfony/console/Symfony/Component/Console/Application.php:119 
PHP 6. Symfony\Component\Console\Application->doRun() phar:///var/bean/deploy/qa/2013-06-03/api/composer.phar/src/Composer/Console/Application.php:117 
PHP 7. Symfony\Component\Console\Application->doRunCommand() phar:///var/bean/deploy/qa/2013-06-03/api/composer.phar/vendor/symfony/console/Symfony/Component/Console/Application.php:212 
PHP 8. Symfony\Component\Console\Command\Command->run() phar:///var/bean/deploy/qa/2013-06-03/api/composer.phar/vendor/symfony/console/Symfony/Component/Console/Application.php:882 
PHP 9. Composer\Command\UpdateCommand->execute() phar:///var/bean/deploy/qa/2013-06-03/api/composer.phar/vendor/symfony/console/Symfony/Component/Console/Command/Command.php:244 
PHP 10. Composer\Installer->run() phar:///var/bean/deploy/qa/2013-06-03/api/composer.phar/src/Composer/Command/UpdateCommand.php:103 
PHP 11. Composer\Installer->doInstall() phar:///var/bean/deploy/qa/2013-06-03/api/composer.phar/src/Composer/Installer.php:208 
PHP 12. Composer\Script\EventDispatcher->dispatchPackageEvent() phar:///var/bean/deploy/qa/2013-06-03/api/composer.phar/src/Composer/Installer.php:476 

任何人都知道可能导致这种情况的原因是什么？如果我将symfony切换到2.3的最新版本，它会得到解决，但我现在不想这么做。

Answer 1

问题是APC操作码缓存。我手动运行下载使用命令行作曲：

php -r "eval('?>'.file_get_contents(' https://getcomposer.org/installer '));"

，并运行该命令时，它通知我说：

The apc.enable_cli setting is incorrect. 
Add the following to the end of your `php.ini`: 
    apc.enable_cli = Off 

所以我把它关掉，它是所有伟大的工作。