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Quick problem with arraycontroller



I have 2 array controllers. the 1st manages an array of Project objects. within the project object there is an NSMutableArray of ProjectInfo objects.
Here is an image of my Interface Builder setup for the 2 controllers:


http://www.design-factor.com/jason/bindings.jpg

The Projects array controller works fine, but when i try to use the array controllers add: for the ProjectInfo controller, it gives me this in the console:
Cannot create NSArray from object NSCFString of class NSCFString


Im new to Cocoa / obj-c so please forgive the possible butchering of terminology. Im sure anyone out there can take a quick look at this and tell me exactly what I'm doing wrong.

Thanks so much,

Jason
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