How to fix “failed codesign verification” of an iPhone project?

Question

Last night, the iPhone project was built perfectly.

This morning, I installed XCode 3.2.3 in a separate folder. When I open the same project in

Answer 1

I've encountered the same problem too. It showed that I had a duplicate certificate registration in my keychains. Removing one of them (I removed the one from my system keychain) fixed the problem.

Steps that helped me to resolve my problem:

1. Open KeyChain Access application
2. Select the 'login' keychain, and select in the bottom pane 'Certificates'
3. Switch to the 'system' keychain and see if there are certificates registered in both chains.
4. Remove one of them
5. Rebuild the application