Code sign error in iPhone?

Currently I am using the Xcode 3.2.5 i am getting problem in 开发者_如何学编程Code Signing on Distribution & Release Don't Code sign but when i selecting Release from Configuration list It's showing my all certificates Distributor and Developer both but why it's not showing any certificates on Distribution & Release ???

Can you select any certificates in the dropdown? Have you created a distribution certificate in the iTunes provisioning portal? You might start there first.

you need to set the Bundle identifier in the info plist file like
com.<yourCompanyName>.<projectName> then you can select the profile and code sign properly