The iPhone app does not run in my old xcode

i made project in Xcode 4.1 in lion OS and when i run the same project in snow leopard 10.6.5 xcode version 3.2.4 i get lot's of error. what's the prob开发者_开发问答lem? is it possible to do any changes in project when i run in xcode 3.2?

In xcode 4, Select your project and look for Project format on the right hand side. Try setting it to xcode 3.2 compatible.