iOS Following the "iPhone App Development Missing Manual" book but ran into an SDK issue

Probably because this book is from 2009 and was made using Xcode 3, while I'm using Xcode 4, but I get this issue when I open one of the projects they use as an exercise for the book:



Can anyone help me figure out how to fix this? It's stopping me from being able to build and run the application.

Thanks in advance.