authentication failure.map v2 show blank screen

Please check..

1. check if the "libs" folder containing the "android-support-v4.jar" exists in your project.
   "android-support-v4.jar" is located in "/extras/android/compatibility/v4/android-support-v4.jar" under your "android-sdk" drectory.
2. Before running your project, you must set your project Build target to "Google APIs", not Android x.x. version : Select your project and click Project > Properties > Project Build Target in Eclipse and select any "Google APIs ", and then run your project on your phone. If you use the emulator, also MUST set the AVD of the emulator to the any "Google APIs ".
3. Once more, you don't need to create the new Google Maps API key in order to test your project, Just use the default provided API key, which is shown as "Key for browser apps (with referers) "in your Google APIs Console.
4. Finally, the most important is to add Google Play services as an Android library project as follows:
   Select File > Import > Android > Existing Android Code Into Workspace and click Next. Select Browse..., enter /extras/google/google_play_services/libproject/google-play-services_lib, and click Finish.
   
   
   Third one is really helpful me.
   Thanks