'filenames are used to distinguish private declarations of the same name' error

Question

I am getting this error on generating an NSManagedObject in Xcode 8.1 in Swift.

:0: error: filename \"DemoOne+CoreDataClass.swift\" used twice: \'/Us

Answer 1

The issue was due a second file named:"Extensions.swift" in my project.

After deleting the duplicate "Extensions.swift" the error got resolved. Your error message might tell you which file is duplicated.