Mach error -308 - (ipc/mig) server died

原来电脑上安装了Xcode10，安装完Xcode11 beta版之后运行模拟器失败，报错

A1D59E94502242A6C5511CC84DFE8983.png

解决办法

1 Uninstall Xcode11
2 Install Xcode 10 (No need to re-install if it's already installed)
3 Remove /Library/Developer/PrivateFrameworks/CoreSimulator.framework
4 Launch Xcode 10 and agree to install command line tools

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