I am using Google maps iOS SDK in my iPhone application. I am showing a place mark on the map and it is working fine in my iPhone device using my ap
Typically this will happen if you don't have the app bundle id added to your google APIs console. The bundle id (eg., com.myname.appname) is what google uses to verify that an app is allowed to use a certain api key. If you've moved your app from one developer account to another, you've probably changed the bundle id in the process. Fortunately, google allows you to associate multiple bundle ids with a single api key.
To add a new bundle id: