WHEN I TRY TO PACKAGE MY ANROID PROJECT IT SAYS
\VolumeReceiver.java:51: error: cannot find symbol
:\app\src\main\java\com\epicgames\unreal\HeadsetReceiver.java:45: error: cannot find symbol
\app\src\main\java\com\google\android\vending\expansion\downloader\impl\DownloaderService.java:1068: error: cannot find symbol
:\app\src\main\java\com\epicgames\unreal\GameActivity.java:802: error: cannot find symbol
:\app\src\main\java\com\epicgames\unreal\BatteryReceiver.java:88: error: cannot find symbol