Xcode始终无法在设备上启动应用：“未知数据包回复：”超时”；到环境数据包。” [英] Xcode consistently fails to launch app on device: "Unknown packet reply: "timeout" to environment packet."

问题描述

自从升级到Xcode 4.2之后，我经常遇到错误，尝试调试应用失败，并显示消息未知数据包回复：环境数据包超时。重新启动设备并不能始终解决问题（尽管有时可以解决），重新启动Xcode或重新启动开发计算机也无法始终如一。清理和重新编译也不能解决问题。

Since upgrading to Xcode 4.2 I've regularly encountered an error where attempting to debug an app fails with the message "Unknown packet reply: "timeout" to environment packet." Restarting the device does not consistently solve the problem (though it sometimes does), nor does restarting Xcode or rebooting the development machine. Cleaning and recompiling also does not fix the problem.

它不仅限于项目；一旦发生，我将无法再通过Xcode启动任何应用。

It's not limited to the project; once it happens I can no longer launch any apps through Xcode.

该设备是运行iOS 4.3.5的iPad；开发机器是运行Lion的Macbook。

The device is an iPad running iOS 4.3.5; the development machine is a Macbook running Lion.

推荐答案

我仍然不知道 是什么原因以前，但是自升级到Mountain Lion和Xcode 4.4.1以来我还没有看到它，因此我正在回答将其标记为关闭的问题。

I still have no idea what was causing this before, but I haven't seen it since upgrading to Mountain Lion and Xcode 4.4.1 so I'm answering the question to mark it closed.

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