I created a blank NavBar project and only touched a couple lines or so on one of the view controllers. I tested it fine in the 4.3 iPad and iPhone emulator but can’t make it work for 4.2 at all. I get an error saying:
The selected run destination is not valid for this action.
This is what I have on my project settings:

Usually in XCode 3 that was all I needed to change but I guess I’m missing some setting in XCode 4.
What could this be?
@pokstad, you are right. I was looking at the wrong place indeed!
Choosing the target and changing the SDk there did the trick.
Thanks!