Unity to Xcode Problem

I am exporting my iphone from unity into xcode but I keep getting this error when I try
to build it:
Code Sign error: The identity ‘iPhone Developer’ doesn’t match any valid, non-expired certificate/private key pair in your keychains

*Using Unity 4
*Exporting for Iphone 4 +
*IOS 5 +

Any ideas? Thanks

It sounds like you haven’t set up your code signing certificate in XCode (or having created it yet).

You can reference: http://docs.unity3d.com/Documentation/Manual/iphone-accountsetup.html
steps 6, 7, & 8 apply to the problem you’re having.