No matter what .icon file I use, even if I test it by creating a whole new clean project, then add a fresh new icon from Xcode. It fails. Tested with icon composer 1.5, 1.6rc, beta 2. I didn't get a crash report/feedback, only the error I attached.

Hey, the only error message I got is attached in the original message, but there were no crash reports. And I tested, no matter what .icon file I use, the issue still happens. Here are more details: Running an existing project with a .icon as the app icon (so not the asset pngs) (Xcode 27) The error appears, and the build fails. I tested this with icon composer 1.5, 1.6rc, beta 2. I tested it by creating a whole new app, and adding the icon with the "new file from template". Didn't work.

https://developer.apple.com/forums/thread/831309?answerId=892115022#892115022

It's an icon composer file