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Bindings problem...

Inaugural attempt at using bindings...
I'm getting the following error on application start: addObserver:forKeyPath:options:context:] is not supported. Key path: points
I'm using the document model with the following bits:
File Owner <- ObjectController -> PointGroup (ControllerArray) -> EuclideanPoint(ControllerArray)

I'm trying to populate an excel style speadsheet (NSTableView) with 4 columns - x,y,z,id. The PointGroup array contains instances of EuclideanPoint. The table displays each instace of EuclideanPoint stored in the PointGroup.

I've got the ObjectController connected to FileOwner, PointGroup bound to ObjectController, and EuclideanPoint bound to PointGroup. Also, each column in my talbeview is bound to the appropriate dictionary.key value in the EuclideanPoint.
Any ideas what I'm missing?
thanks,
/dylan

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