'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

Select code data model then select the Entity change the value of 'Codegen' to Manual/None.

It will work.