Xcode error: Failed to launch simulated application

Question

Problem

Unlike people have asked at here and here, I got this error after a brand new installation of Leopard (hackintosh), this problem really driving me crazy a

Answer 1

why anybody didn't tell about restarting simulator.

In my case,

 Resetting the iPhone with Reset Content and Settings

 and 

 **ReStart Simulator** 

works well~