Angry Birds may not be opening and working because of some issues with your device or a poor internet connection.
You have to follow the instructions carefully to fix this problem.
2. You have to Force stop the application.
3. After that, free up both Internal & External storage.
4. Then update the app & open it using the Google Play store.
5. Enter into App info and clear the Cache Data.
6. Finally restart your mobile phone to check if the error is resolved.