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java.util.ConcurrentModificationException: 	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:787)	at java.util.HashMap$KeyIterator.next(HashMap.java:814)	at openprojects.atvt.ui.VideoAdapter.getLiveTvBookmarks(VideoAdapter.java:107)	at openprojects.atvt.ui.MainActivity.switchRowsFragment(MainActivity.java:323)	at openprojects.atvt.ui.MainActivity.setPosition(MainActivity.java:378)	at openprojects.atvt.ui.MainActivity.access$500(MainActivity.java:48)	at openprojects.atvt.ui.MainActivity$4.onRequestChildFocus(MainActivity.java:268)	at android.support.v17.leanback.widget.BrowseFrameLayout.requestChildFocus(BrowseFrameLayout.java:124)	at android.view.ViewGroup.requestChildFocus(ViewGroup.java:740)	at android.view.ViewGroup.requestChildFocus(ViewGroup.java:740)	at android.view.ViewGroup.requestChildFocus(ViewGroup.java:740)	at android.support.v7.widget.RecyclerView.requestChildFocus(RecyclerView.java:2106)	at android.view.ViewGroup.requestChildFocus(ViewGroup.java:740)	at android.view.View.handleFocusGainInternal(View.java:5471)	at android.view.View.requestFocusNoSearch(View.java:8476)	at android.view.View.requestFocus(View.java:8455)	at android.view.ViewRootImpl$ViewPostImeInputStage.processKeyEvent(ViewRootImpl.java:4203)	at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4089)	at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3642)	at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3695)	at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3661)	at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3787)	at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3669)	at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3844)	at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3642)	at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3695)	at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3661)	at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3669)	at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3642)	at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3695)	at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3661)	at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3820)	at android.view.ViewRootImpl$ImeInputStage.onFinishedInputEvent(ViewRootImpl.java:3981)	at android.view.inputmethod.InputMethodManager$PendingEvent.run(InputMethodManager.java:2253)	at android.view.inputmethod.InputMethodManager.invokeFinishedInputEventCallback(InputMethodManager.java:1874)	at android.view.inputmethod.InputMethodManager.finishedInputEvent(InputMethodManager.java:1865)	at android.view.inputmethod.InputMethodManager$ImeInputEventSender.onInputEventFinished(InputMethodManager.java:2230)	at android.view.InputEventSender.dispatchInputEventFinished(InputEventSender.java:141)	at android.os.MessageQueue.nativePollOnce(Native Method)	at android.os.MessageQueue.next(MessageQueue.java:323)	at android.os.Looper.loop(Looper.java:135)	at android.app.ActivityThread.main(ActivityThread.java:5417)	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)