Xcode 'CodeSign error: code signing is required'

Question

I\'ve been working on an iPhone project with iOS 4.0. I just downloaded Xcode 3.2.4 with iOS SDK 4.1 so that I can work with the updated iOS. Upon opening the project in the

Answer 1

1. Populate "Code Signing" in both "Project" and "Targets" section
2. Select valid entries in "Code Signing Identity" in both "Debug" and "Release"
3. Under "Debug" select you Developer certificate
4. Under "Release" select your Distributor certificate

Following these 4 steps always solves my issues.