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Failed to start launchd_simエラーでSimulatorが起動できなくなった時の対処方法
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Xcode12にアップデートした後にiOS Simulatorが下記のエラーが出て起動できなくなった。

Failed to start launchd_sim: could not bind to session, launchd_sim may have crashed or quit responding Domain: com.apple.SimLaunchHostService.RequestError

↓これを参考に

https://stackoverflow.com/questions/40238266/launchd-sim-crashing-could-not-create-temporary-state-directory

/Volumes/.../private/tmpディレクトリの権限を変更したら、起動できるようになった。

chmod 1777 /Volumes/.../private/tmp
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