Unit testing in Xcode doesn't work like in Apple's example

Question

Possible Duplicate:
Implementing Unit Testing on the iPhone

I'm trying to follow Apple's example of how to set up unit testing...

I started a new project and followed the directions. Instead of getting an error message inside the code editor (like in step 8), I get two error messages that are shown on the bottom right icon. When I click it, I see the following errors:

Command /bin/sh failed with exit code 1.
Must fail to succeed.

How can I fix this? Do I need to reinstall Xcode because I might have changed some hard to find setting that fixes this problem?

Update:
I tried installing another version of Xcode to another directory, but it didn't help.

I'm using Xcode 3.2.3.

Update: See http://stackoverflow.com/questions/2002330/implementing-unit-testing-on-the-iphone