invalid redeclaration in auto code generate NSManagedObject Subclass Swift 3

Question

Using Version 8.1 of Xcode.

Create an entity named \"MapRegionObject\" in .xcdatamodeld file.

Using auto code generator, click Editor on the navigation bar -

Answer 1

1) clean the project (cmd + shift + K)

2) In the "data model inspector" for every created Entity set attributes for Class just as in the screenshot below

3) Generate code again (Editor -> create NSManagedObject Subclasses)

After that everything should work fine.