When first time using location based feature on your app, your app must send a request authorization message to user to authorise location usage.
In order to create the location-based notification in iOS8, app must define the string in Info.plist file under the NSLocationWhenInUseUsageDescription or NSLocationAlwaysUsageDescription.
The message will be a description to user how the app will be using the location feature. Remember that if you do not add this string, your app may not be able to use location based feature!