[MJSONWP] Encountered internal error running command: Error: Unable to launch WebDriverAgent because of xcodebuild failure: "Unable to start iproxy. Is it installed?". Make sure you follow the tutorial at https://github.com/appium/appium-xcuitest-driver/blob/master/docs/real-device-config.md. Try to remove the WebDriverAgentRunner application from the device if it is installed and reboot the device.

我想知道这个 iproxy 是在哪一步安装上的。
环境按照操作步骤安装，没有遇到 error 啊，怎么 iproxy 没有安装？