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

This error happened to me when I forgot to change entity Properties before creating NSManagedObject subclass. Solved by:

1. delete Entity+CoreDataClass.swift and Entity+CoreDataProperties.swift.
2. under "class" of the entity model inspector, change "module" to Current Product Module and "codegen" to Manual/None.
3. recreate the NSManagedObject.