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iOS Build a Diary App Using Core Data Understanding Core Data Defining our Data Model

error: "Linker command failed with exit code 1(use -v to see invocation)" when adding NS_ENUM to THDiary.h

I typed my code exactly as the video instructed (although I am using xcode 7) and I get that error. However, when I add NS_ENUM to THDiary.m rather than .h the error goes away. I'm just wondering why that is and whether this will cause problems later in the course.

Edit: I'm able to add it to the .h file when I change NS_ENUM to a simple C enum. I would still like to know why that is please.