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I have strange problem when I try to add new item to NSArrayController. My XIB file have NSView, NSArrayController and two custom buttons (add & remove). I think my bindings are OK.

When press "Add" button program raises Exception.

I set a breakpoint to objc_exception_throw and locate the problem in

[NSArrayController _executeAdd:didCommitSuccessfully:actionSender:]

One more thing. Source for NSArrayController is Entity, not Class.

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