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This exception has no message.
java.lang.Throwable at android.os.Environment.throwIfSystem(Environment.java:637) at android.os.Environment.getExternalStorageDirectory(Environment.java:316) at com.android.MtpApplication.MtpReceiver.onReceive(MtpReceiver.java:1137) at android.app.ActivityThread.handleReceiver(ActivityThread.java:2441) at android.app.ActivityThread.access$1600(ActivityThread.java:150) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1356) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:175) at android.app.ActivityThread.main(ActivityThread.java:5279) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:511) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869) at dalvik.system.NativeStart.main(Native Method)