我试图在Ubuntu上用composer创建一个Symfony2项目，命令是：
php composer.phar create-project symfony/framework-standard-edition projectpath
我得到这个错误
Installing symfony/framework-standard-edition (dev-master 506ffaab8d8474db2512fca879ca4b9877616a1e)
- Installing symfony/framework-standard-edition (dev-master master)
Cloning master
Created project in projectpath/
Loading composer repositories with package information
Installing dependencies from lock file
Your lock file is out of sync with your composer.json, run "composer.phar update" to update dependencies
Your requirements could not be resolved to an installable set of packages.
Problem 1
- Installation request for symfony/symfony == 2.1.9999999.9999999-dev -> satisfiable by symfony/symfony 2.1.x-dev.
- Can only install one of: symfony/symfony dev-master, symfony/symfony 2.1.x-dev.
- Installation request for symfony/symfony == 9999999-dev -> satisfiable by symfony/symfony dev-master.
composer.phar更新也返回一个错误。
有什么想法吗？
尝试指定您想要的确切版本，它现在已经在symfony标准repo中修复，这应该可以工作：
php composer.phar create-project symfony/framework-standard-edition projectpath 2.1.x-dev