Xcode 4: Build Failed, No Issues

Question

The app works fine in the simulator, builds and runs.

When I attach my device (iPhone 3GS running iOS 4.3) and target the iPhone, the result is \"Build failed\" with

Answer 1

I know what the problem is: In Info.plist -> Bundle Identifier: you can not use '_'. For example, com.mycompany.My_app is not valid, but com.mycompany.My-app OK.