When trying to run SwiftUI previews, it fails with "SimulatorShutdownUnexpectedlyError - Simulator was shutdown during an update"

Question

elliotfiske OP

Created 1d

Replies 2

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Participants 2

My main app target builds fine and can run on Simulator without issue.

Whenever I try to run a Preview, I get this error:

== DATE:

    Monday, November 3, 2025 at 2:52:23 PM Pacific Standard Time
    
    2025-11-03T22:52:23Z


== PREVIEW UPDATE ERROR:

    SimulatorShutdownUnexpectedlyError: Simulator was shutdown during an update
    
    Simulator [F85A5AF1-F52C-4662-AFCD-762F87AF537D] failed to boot and may have crashed.

This seems like it started happening after updating to MacOS 26. I've tried reinstalling all Simulators, tried on Xcode 26, deleted derived data, restarted Xcode and my Mac several times.

What other troubleshooting steps can I take?

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Answer 1

Developer Tools Engineer OP

Apple

1d

Hi,

Sorry to hear you are having problems getting previews working.

Unless you have any data stored in the previews simulators you could try running xcrun simctl --set previews delete all to see if that gets things up and running again.

1

Answer 2

elliotfiske OP

14h

Hi,

Thanks for the reply – I tried running that command but the problem persists.

Here is the diagnostics report from Xcode: https://drive.google.com/file/d/1OyuTtcuRti5DsLM09O0YMdoQq946LaLM/view?usp=sharing

It seems that Xcode Previews can't create a simulator correctly – it tries repeatedly but is unable to find the correct runtime.

Additionally, the simctl script refers to version 1010.15 of CoreSimulator, but my current actual CoreSimulator version is 1048.

0