Push Notification in iPhone

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Mobile

iPhone

iOS

Xcode

I tried push notification from this link,

http://www.raywenderlich.com/32960/apple-push-notification-services-in-ios-6-tutorial-part-1

i followed the procedure properly,

While running the project i am not able to see the notification alert,
and i am getting the error as,

Failed to get token, error: Error Domain=NSCocoaErrorDomain Code=3000 "no valid 'aps-environment' entitlement string found for application" UserInfo=0x1ed91d90 {NSLocalizedDescription=no valid 'aps-environment' entitlement string found for application}

whats is wrong in it...plz help...