Xcode: Build Failed, but no error messages

Question

Using Xcode 4.5.1. Our project has been building fine for the last three months, but suddenly, when I try to build, it says \"Build failed\", but does not show any errors on the

Answer 1

This will also often happen if the "magical" macOS automatically restarts XCode after boot. That auto-started XCode instance will be completely broken. Quit and restart.