Adding PushNotification service to an iPhone app

I am trying to implement Push Notification from server site in my application since many day but I am unable to get push notification service in my application. but I am getting this error:

error : Domain=NSCocoaErrorDomain Code=3000 'no valid' aps- environment' entitlement string found for application UserInfor=0x170140 {NSLOcalizedDescription=no valid 'aps- environment' entitlement string found for application}

Can any one help me out to resolve this error?

Or give me some more clear steps what I am missing in my application.

Actually I have to Send notification on some changes in my Server side application. Like If some one post a Blog on the site it should be shown in every app holder开发者_JAVA技巧. For this we need to generate the JSON. So my main worry is how to connect my Server or my JSON updates with PushNotification service. I Think now it's more clear.

Thank you.

perhaps this will help you: http://blog.boxedice.com/2009/07/10/how-to-build-an-apple-push-notification-provider-server-tutorial/

and try to do a bit of googling!!