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xamarin.ios - Using Three20 TTPhotoViewController with MonoTouch

I'm trying to use the Three20 TTPhotoViewController with MonoTouch. I've derived FacebookPhoto from TTPhoto and FacebookPhotoSource from TTPhotoSource and am now trying to invoke the TTPhotoViewController but I get the following exception when pushing the view controller:

Objective-C exception thrown. Name: NSInvalidArgumentException Reason: * -[NSPlaceholderString initWithFormat:locale:arguments:]: nil argument

I noticed that the monotouch bindings in this github project: https://github.com/mono/monotouch-bindings/tree/492f68c3c2007f0638452cc8a5a762556db224ba/Three20/binding were missing the photoAtIndex binding, so I added that and recompiled them, but I haven't been able to figure out why I am getting this exception.

Here is how I'm invoking the TTPhotoViewController:

Here is the definition of the TTPhotoSource

and here is the definition of the FacebookPhoto:


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