Dashcode questions

As I am wont to do in a cyclical fashion, I've started running through some programming tutorials. I decided I would take a swing at some Dashcode, but even the basic walkthrough is failing for me. I've created the app described here and everything works fine, but the search function doesn't grab the active data it's supposed to. Instead it just searches for 'null'. Weird. I entered in the three lines of code exactly as described, it's just not hooking up properly. Anyone know what I did wrong here?

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