Code generation for Core Data is not available for Swift 2.3 as the error states (as of Xcode 8 Beta 2).
Just create your entity classes and your @NSManaged attributes yourself.
In XCode Model Editor you'll find an option in the Data Model Inspector to disable automatic code generation ( Class -> CodeGen -> Manual/None ).
In XCode Model Editor you'll find an option in the Data Model Inspector to disable automatic code generation (Class -> CodeGen -> Manual/None) For more detail Here is work around.
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