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

In file /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk/SDKSettings.plist

change the CODE_SIGNING_REQUIRED YES

to

CODE_SIGNING_REQUIRED NO

Restart Xcode