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java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.view.View.findViewById(int)' on a null object reference	at butterknife.ButterKnife.findById(ButterKnife.java:343)	at cgeo.geocaching.CacheDetailActivity.updateOfflineBox(CacheDetailActivity.java:2241)	at cgeo.geocaching.CachePopupFragment$StoreCacheClickListener$3.call(CachePopupFragment.java:206)	at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:55)	at android.os.Handler.handleCallback(Handler.java:739)	at android.os.Handler.dispatchMessage(Handler.java:95)	at android.os.Looper.loop(Looper.java:145)	at android.app.ActivityThread.main(ActivityThread.java:5832)	at java.lang.reflect.Method.invoke(Native Method)	at java.lang.reflect.Method.invoke(Method.java:372)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1399)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194)