Build fails with “Command failed with a nonzero exit code”

Question

When I try to build my app with Xcode, an error interrupts the build process:

Command CompileStoryboard failed with a nonzero exit code

Answer 1

Closing Xcode for me didn't have an effect. Instead, I cleaned the project using CommandShiftK.

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I also found another reason: I had a storyboard reference to another storyboard which I had removed. The quick fix was deleting this.