Xcode 6.0.1 Command /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swiftc failed with exit code 1

Question

I am getting this error on archive:

Command /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swiftc failed with

Answer 1

If using Core Data:
I had a Core Data entity for which I created the NSManagedObject subclasses (with Xcode's help). In addition, the entity was configured to generate code automatically (see screenshot), so basically 2 classes existed during runtime. Just switch the option to Manual/None and it won't generate it.