IPhone SDK: Navigation Hierarchy Problem

Hello!
I've started developing for the iPhone and read through the programming guides of the developer site.
As my first application I've wanted to make a navigation hierarchy. When I click in the MainWindow on a button a second view is put on the navigation controller and is displayed. But when I click on a button in this appeared view the application crashes instead of displayed another view.
Here you can find the code: [Click|http://chaossanctuary.ch.ohost.de/navigation.zip]
Maybe someone can help me, but I don't know how to make further on.
Thanks in advice for your answers!
Greets

Could you let me know as where is the xcode setting through which it is looking for the compiler in the following path ? This path is probably wrong (Pls refer to the error messages)
I'm not sure this will be of any help to you -- I'm not sure if it's the answer you're looking for, since I don't really know enough on the subject. However, this may answer your question, or at least maybe help you find the answer for yourself, so it's worth a shot. Try going to Edit Project Settings in the Project menu, and once the Project Settings open, select the Build tab. Search through this and see if you find any preferences along the lines of what you are looking for. In particular I would try the sections toward the bottom about the GCC 4.0 compiler. Sorry if this was a waste of time, but I wanted to try...

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Build helloworldxc of project helloworldxc with configuration Debug
ProcessPCH /var/folders/P-/P-zMg0EzHree36VYyqKEvU+TI/-Caches-/com.apple.Xcode.501/SharedPrecompiledHeaders/helloworldxcPrefix-gylsydenhucpkgfnujlgvzvhfhzd/helloworldxcPrefix.pch.gch helloworldxc_Prefix.pch normal i386 objective-c com.apple.compilers.gcc.4_2
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