Hi, I am new to iphone Application Development. I am using mac 10.5.3, xcode 3.1.1 and simulator is aspen 1.2. When i created new project from xcode it is working properly. But i download examples from iPhone developer site, or some other places, when i open those projects with xcode and when i click "build and go", it is showing the following error. Checking Dependencies Error : There is no SDK with specified name or path "iPhone2.0". Can any one tell how to solve this problem?: Thanks in advance.