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java.lang.IllegalArgumentException: target object must not be null	at com.virtualengine.reflect.Validate.isTrue(Validate.java:32)	at com.virtualengine.reflect.FieldUtils.writeField(FieldUtils.java:159)	at com.virtualengine.hook.handle.INotificationManagerHookHandle.hackNormalNotification(INotificationManagerHookHandle.java:633)	at com.virtualengine.hook.handle.INotificationManagerHookHandle.access$500(INotificationManagerHookHandle.java:63)	at com.virtualengine.hook.handle.INotificationManagerHookHandle$enqueueNotificationWithTag.beforeInvoke(INotificationManagerHookHandle.java:548)	at com.virtualengine.hook.HookedMethodHandler.doHookInner(HookedMethodHandler.java:48)	at com.virtualengine.hook.binder.BinderHook.invoke(BinderHook.java:59)	at com.virtualengine.hook.binder.INotificationManagerBinderHook.invoke(INotificationManagerBinderHook.java:34)	at java.lang.reflect.Proxy.invoke(Proxy.java:393)	at $Proxy3.enqueueNotificationWithTag(Unknown Source)	at android.app.NotificationManager.notify(NotificationManager.java:230)	at android.app.NotificationManager.notify(NotificationManager.java:194)	at com.mephone.greenbox.activity.NotificationItem.show(NotificationItem.java:99)	at com.liulishuo.filedownloader.notification.BaseNotificationItem.show(BaseNotificationItem.java:46)	at com.liulishuo.filedownloader.notification.FileDownloadNotificationHelper.showIndeterminate(FileDownloadNotificationHelper.java:105)	at com.liulishuo.filedownloader.notification.FileDownloadNotificationListener.showIndeterminate(FileDownloadNotificationListener.java:92)	at com.liulishuo.filedownloader.notification.FileDownloadNotificationListener.pending(FileDownloadNotificationListener.java:138)	at com.mephone.greenbox.activity.NotificationListener.pending(NotificationListener.java:64)	at com.liulishuo.filedownloader.FileDownloadListener.callback(FileDownloadListener.java:60)	at com.liulishuo.filedownloader.FileDownloadMessenger.handoverMessage(FileDownloadMessenger.java:255)	at com.liulishuo.filedownloader.FileDownloadMessageStation$UIHandlerCallback.dispose(FileDownloadMessageStation.java:179)	at com.liulishuo.filedownloader.FileDownloadMessageStation$UIHandlerCallback.handleMessage(FileDownloadMessageStation.java:170)	at android.os.Handler.dispatchMessage(Handler.java:107)	at android.os.Looper.loop(Looper.java:207)	at android.app.ActivityThread.main(ActivityThread.java:5728)	at java.lang.reflect.Method.invoke(Native Method)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:679)