There has been an issue with building Loop from a zip file (LoopDocs) every since Jan 14, 2021. Carthage is automatically upgraded to the latest version when you build from a zip file. The current “latest” Carthage version is 0.36.1, which will not build Loop, and it will throw a “lipo” error. If you can wait for an official fix, please do so. If not, the following workaround will let you downgrade Carthage and build Loop successfully.