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com.afollestad.materialdialogs.MaterialDialog$DialogException: Bad window token, you cannot show a dialog before an Activity is created or after it's hidden.	at com.afollestad.materialdialogs.MaterialDialog.show(MaterialDialog.java:1428)	at com.afollestad.materialdialogs.MaterialDialog$Builder.show(MaterialDialog.java:1417)	at com.alorma.github.ui.activity.IssueDetailActivity.showError(IssueDetailActivity.java:383)	at com.alorma.github.ui.activity.IssueDetailActivity$2.onError(IssueDetailActivity.java:242)	at rx.observers.SafeSubscriber._onError(SafeSubscriber.java:152)	at rx.observers.SafeSubscriber.onError(SafeSubscriber.java:115)	at rx.internal.operators.OperatorObserveOn$ObserveOnSubscriber.checkTerminated(OperatorObserveOn.java:276)	at rx.internal.operators.OperatorObserveOn$ObserveOnSubscriber.call(OperatorObserveOn.java:219)	at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:55)	at android.os.Handler.handleCallback(Handler.java:739)	at android.os.Handler.dispatchMessage(Handler.java:95)	at android.os.Looper.loop(Looper.java:148)	at android.app.ActivityThread.main(ActivityThread.java:5461)	at java.lang.reflect.Method.invoke(Native Method)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)