Redmine2.2.0启动报mysql链接错误

在虚拟机CentOS 5装了个dotProject后，又装了个redmine2.2.0,启动时发现前几天正常运行的Redmine启动不了了，控制台输出错误信息以下：php => Booting WEBrick => Rails 3.2.9 application starting in production on http://0.0.0.0:3000 => Call with -d to det

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