I'm on the latest beta version of Xcode (Xcode 4.5 with iOS 6.0). I've got an xcode project for an iphone app and I want to add a Unit Test target on it. I've followed carefully the instructions given on this page but I can't run the tests. Here's the message I read in the console: 

Failed to find SDK: '6.0'  
error: failed to attach to process ID 0

The target corresponding to the main application runs perfectly well on the iPhone 6.0 simulator though.

Where can I have made a mistake?

xcode unit-testing ios6
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