When I update the macOS from 15.5 to 15.6, Preview error. 1、I try remove simulator cache， sdk 2、remove Xcode build cache 3、reinstall Xcode 4、try with this method https://byby.dev/uninstall-xcode#:%7E:text=Delete%20old%20simulators%20and%20devices,moving%20them%20to%20the%20Trash but all failed
but I run from debug, simulator run ok
preview always failed,
Simulator [E9CBC743-2B12-4EA4-BDAD-2BB05291C83D] failed to boot and may have crashed.
I'm experiencing the same problem on macOS 15.6 and latest Xcode. I've tried all the incantations of cleaning the build folder, quitting and re-launching, deleting the derived data, etc. I also deleted and re-installed Xcode from the App Store, but still no joy. I'll try downloading Xcode from the Developer website next and see if that works.
hello, sgraff
I can't fixed it use your method, I select "swift-6.1-RELEASE.xctoolchain" to build preview also failed.
I delete the open source version use Xcode default 16.4 version also failed.
update Xcode 26 Beta 6 Fixed it
Simulators may fail to boot during the first build after upgrading macOS; rebuilding after a short wait typically resolves the issue. (152328794)