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今朝から、Symfony でベンダー パッケージを更新できません。次のエラーが表示されます。

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

誰がこれを引き起こしたのか知っていますか？symfony を最新バージョンの 2.3 に切り替えれば解決しますが、現時点ではそうしたくありません。

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