Fatal error after switching from Intel to Mac version

Support
1

Got a popup today saying I should switch from Intel to Apple Silicone Valley versions. I did, and now I’m getting this error each time I try to start my site.

How do I resolve it? TIA for assistance.

Screenshot 2025-08-16 at 1.46.29 PM
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Screenshot 2025-08-16 at 1.46.53 PM
Screenshot 2025-08-16 at 1.46.53 PM493×311 36.4 KB

What steps can be taken to replicate the issue? Feel free to include screenshots, videos, etc

System Details

  • Local Version: Version 9.2.6+6872

  • Operating System (OS) and OS version: Sequoia 15.5 (24F74)

Local Logs

Attach your Local Logs here (Help Doc - Retrieving Local’s Log)

local-lightning copy.log (567.7 KB)

Security Reminder
Local does a pretty good job of scrubbing private info from the logs and the errors it produces, however there’s always the possibility that something private can come through. Because these are public forums, always review the screenshots you are sharing to make sure there isn’t private info like passwords being displayed.

2

Thanks for your report, @Spacemonkey5.

You can try re-importing your site from the existing site files by following this guide:

https://localwp.com/help-docs/getting-started/how-to-import-a-wordpress-site-into-local/#restore-local-site-from-site-files

The cause seems to be that Local is trying to start MySQL 8.0.16 for this site when the site’s database was made with MySQL 8.0.35:

Cannot boot server version 80016 on data directory built by version 80035. Downgrade is not supported

But it’s not clear why this would happen if you haven’t modified Local’s sites.json file. It’s not something we saw during testing.

Please let us know if you need further help after trying the suggested re-import above.