Dear all,

I'm having a problem when building my Iphone app with Xcode.
When simulating my app, it all works fine, but when building it to iphone device 3.x.x , it keeps giving me errors like;

Code Sign error: The identity 'iPhone Developer:xxxxxxx doesn't match any valid certificate/private key pair in the default keychain"

I've downloaded The Xcode program from Apple's developer page.
Do I need to obtain for a license to solve this error?

Thanks for your help