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java.lang.NullPointerException: 	at android.content.ContextWrapper.getApplicationInfo(ContextWrapper.java:152)	at android.view.ContextThemeWrapper.getTheme(ContextThemeWrapper.java:103)	at android.app.AlertDialog.resolveDialogTheme(AlertDialog.java:143)	at android.app.AlertDialog$Builder.(AlertDialog.java:360)	at promocje.MainActivity.showAlert(MainActivity.java:164)	at promocje.db.engine.DatabaseHandler.useCoupon(DatabaseHandler.java:889)	at promocje.adapter.CouponListAdapter.useCoupon(CouponListAdapter.java:166)	at promocje.adapter.CouponListAdapter$1$1.onFinish(CouponListAdapter.java:144)	at android.os.CountDownTimer$1.handleMessage(CountDownTimer.java:118)	at android.os.Handler.dispatchMessage(Handler.java:102)	at android.os.Looper.loop(Looper.java:136)	at android.app.ActivityThread.main(ActivityThread.java:5017)	at java.lang.reflect.Method.invokeNative(Native Method)	at java.lang.reflect.Method.invoke(Method.java:515)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)	at dalvik.system.NativeStart.main(Native Method)