MacOS app does not run on the Xcode simulator

Question

I\'ve installed Xcode 4.2.1 on Mac OS X Lion.

When I create a new (Mac OS X Cocoa) project and I click \"Run\", Xcode says build succeeded, but does

Answer 1

Do you have the correct project selected to run?

Click on the project name next to the stop button (top left). Are there multiple projects listed? Do you have the correct one selected?