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java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.content.Context.getPackageName()' on a null object reference	at android.app.PendingIntent.getBroadcastAsUser(PendingIntent.java:526)	at android.app.PendingIntent.getBroadcast(PendingIntent.java:515)	at blackeyeonandroid.iosystem.co.kr.toastama.MyService$DeviceDetectAsync.doInBackground(MyService.java:124)	at blackeyeonandroid.iosystem.co.kr.toastama.MyService$DeviceDetectAsync.doInBackground(MyService.java:105)	at android.os.AsyncTask$2.call(AsyncTask.java:295)	at java.util.concurrent.FutureTask.run(FutureTask.java:237)	at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)	at java.lang.Thread.run(Thread.java:818)