How to fix "Unable to boot the iOS simulator" error

⋅ 1 min read ⋅ Xcode Fastlane

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Today, while I was trying to run an iOS project, an iOS simulator failed to launch with the following error.

Unable to boot the iOS simulator.

There might be several reasons that cause this error. I find many solutions out there, but I will share the one that works for me. And I hope it will also work for you.

Solution

For me, the solution for this error is to nuke all the simulators and recreate them. It sounds scary, but Fastlane has an action named reset_simulators that do all the hard lifting for you.

The only thing you need to do is install Fastlane and run the following command.

fastlane snapshot reset_simulators

You will be asked for confirmation.

Are you sure? All your simulators will be DELETED and new ones will
be created! (You can use `SNAPSHOT_FORCE_DELETE` to skip this confirmation)
(y/n)

Just type "y" and continue. Then, you will see deleting and creating logs—something like this.

[23:38:35]: Deleting iPhone 6s
[23:38:35]: Deleting iPhone 6s Plus
[23:38:35]: Deleting iPhone SE (1st generation)
[23:38:35]: Deleting iPhone 7
[23:38:35]: Deleting iPhone 7 Plus
...

Creating iPhone 6s for iOS version iOS 15.4
Creating iPhone 6s Plus for iOS version iOS 15.4
Creating iPhone SE (1st generation) for iOS version iOS 15.4
Creating iPhone 7 for iOS version iOS 15.4
Creating iPhone 7 Plus for iOS version iOS 15.4
...

After the action is finished, your simulator should be working again.


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