RSS Photo Viewer not working

So in trying to learn CocoaRuby on Xcode 3, I've tried this ADC tutorial and I know I've done it correctly, but I can't get the app to run. (I've done this app from scratch twice, the second time using cut and past for the large chunks of code.)
.I 'build' the code using Xcode. Then, I hit either 'Go' or double click the .app file. The app icon appears in the Dock for about a second and then disappears. With the 'Go' method, Xcode tells me the application ended with a status of 1. What's going on here?
Thanks,
David

I've managed to get the application to start by linking to the Quartz framework in XCode.
To do this right click on the "Linked Frameworks" group in XCode, and select "Add -> Existing Frameworks..." in the menu. You'll then be presented with a list of available frameworks, browse through the list for Quartz.framework and double click.
Unfortunately while the application will run, the image browser view completely fills the window. The other controls will still accept input (try clicking where the url field should be), but I can't see them.
I have no idea why this is happening, as I'm only just starting out with Cocoa development, but if anyone can shed any light I'll be a happy bunny.

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