Core Data: Keypath Error Not Found in Entity

Question

Could any one tell me what\'s the wrong with this code? It raises the following error and cause application to crash:

reason: \'keypath Studies.patients.Patient         


        

Answer 1

Usually when I see this error it means that I added a new Version to my Model but forgot to update the Current Model Version for the project.

Posting this answer to help my future self because it's not the first time I have landed on this page!