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.
1. You will need to uninstall the 3rd Party Angry Bird supporting app and enter it into App info.
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.