Xcode crashes when I try to Add New Version of Core Data model

Question

I have the latest version of Xcode and when I select my .xcdatamodel file and then select "Data Model" => "Add Model Version", I get the following dialog:

Internal Error

File: ... Line: ... Object: ... Method: ...

Couldn't create new version 'MyApp1 2.xcdatamodel' in version group 'MyApp1.xcdatamodeld'

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It wiped out the old .xcdatamodel directory and created a new .xcdatamodeld directory, but there is nothing it it.

Fortunately I have an old copy of the original directory and I can restore it with little difficulty, but I need to update the schema in a way that will migrate old versions.

Any idea of how I can do this by hand?

Answer 1

This was happening to my project when the Project Format is set to Xcode 3.2-compatible. This setting is under the info window, Project Format drop down. I had changed it from the default, for not particular reason.

Setting it back to the default, Xcode 3.1-compatible, made the problem go away for me. I'm using 3.2.4 and the iOS 4.1 GM SDK.

Answer 2

I have the same problem, and the answer posted regarding project format didn't help.

I created a new core data xcode project, and noticed that the model in the new one is a file of type "xcdatamodeld" which can be expanded, and contains an "xcdatamodel" file ... however, in my project, I don't have the former, just the latter?!

Does anyone have any ideas how to convert my model, which seems to be in an old or screwed up format into one with a xcdatamodeld?