'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

May help someone, Go to project compile source delete the extra reference if any.

Answer 2

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

It will work.

Answer 3

I just restart my Macbook and that clean my build folder. And it works like a charm!

Answer 4

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.

Answer 5

In my case Data Model (as example: MyCoreData.xcdatamodeld) was listed twice under Editor -> Create NSManagedObject Subclass... And here was reason why it was getting this type of error.

What I did:

1. I did delete MyCoreData.xcdatamodeld file.
2. Created another Data Model as example MyCD.xcdatamodeld.
3. Checked is here duplicated Data Models in here: Editor -> Create NSManagedObject Subclass...
4. Clean and later build for two times.

Answer 6

It happened to me when I copied and renamed entity. It failed to rename the class, so do it manually.