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java.lang.NullPointerException: 	at org.xwalk.core.XWalkPreferences.setValue(XWalkPreferences.java:107)	at org.xwalk.core.xwview.shell.XWalkViewShellActivity.onXWalkViewCreated(XWalkViewShellActivity.java:367)	at org.xwalk.core.xwview.shell.XWalkViewSectionFragment.onCreateView(XWalkViewSectionFragment.java:42)	at android.app.Fragment.performCreateView(Fragment.java:1700)	at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:890)	at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1062)	at android.app.BackStackRecord.run(BackStackRecord.java:684)	at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1447)	at android.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:479)	at android.support.v13.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:145)	at android.support.v4.view.ViewPager.populate(ViewPager.java:1073)	at android.support.v4.view.ViewPager.populate(ViewPager.java:919)	at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1441)	at android.view.View.measure(View.java:16497)	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)	at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)	at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)	at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)	at android.view.View.measure(View.java:16497)	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)	at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)	at android.view.View.measure(View.java:16497)	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)	at com.android.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:327)	at android.view.View.measure(View.java:16497)	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)	at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)	at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2291)	at android.view.View.measure(View.java:16497)	at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1916)	at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1113)	at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1295)	at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1000)	at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5670)	at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)	at android.view.Choreographer.doCallbacks(Choreographer.java:574)	at android.view.Choreographer.doFrame(Choreographer.java:544)	at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)	at android.os.Handler.handleCallback(Handler.java:733)	at android.os.Handler.dispatchMessage(Handler.java:95)	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)