I encounter the same issue, Xcode Version 26.0.1 (17A400); Metal Toolchain 26.0.1(17A324). this issue reappear after I restart my computer. I think there is also a bug not fix by Xcode26

I encountered the same problem(https://developer.apple.com/forums/thread/805547) and the Feedback Assistant: FB20864165 @JMDelh Have you solved this problem？

after two days try I fixed this problem by followed the methods in this article(https://medium.com/@sergey-pekar/how-to-fix-annoying-xcode-26-not-building-swiftui-previews-error-cannot-execute-tool-metal-due-49564e20357c), I think it is also has a bug for install Metal Toolchain at least for those migrated from Xcode26 Beta

after two days try I fixed this problem by followed the methods in this article(https://medium.com/@sergey-pekar/how-to-fix-annoying-xcode-26-not-building-swiftui-previews-error-cannot-execute-tool-metal-due-49564e20357c), I think it is also has a bug for install Metal Toolchain at least for those migrated from Xcode26 Beta

I encountered the same problem even I used the Xcode26 Xcode26.0.1 Xcode26.1(https://developer.apple.com/forums/thread/805547) after two days try I fixed this problem by followed the methods in this article(https://medium.com/@sergey-pekar/how-to-fix-annoying-xcode-26-not-building-swiftui-previews-error-cannot-execute-tool-metal-due-49564e20357c) I think there is still has a bug for install Metal Toolchain at least for those migrated from Xcode26 Beta

@Product Manager I installed the Metal Toolchain by Settings > Component panel but it's not work, the component appear in Xcode component panel, but compile error because miss Metal Toolchain I encountered the same problem even I used the Xcode26 Xcode26.0.1 Xcode26.1(https://developer.apple.com/forums/thread/805547) after two days try I fixed this problem by followed the methods in this article(https://medium.com/@sergey-pekar/how-to-fix-annoying-xcode-26-not-building-swiftui-previews-error-cannot-execute-tool-metal-due-49564e20357c) I think there is still has a bug for install Metal Toolchain at least for those migrated from Xcode26 Beta