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java.lang.NullPointerException: 	at org.xwalk.core.internal.XWalkSettingsInternal$EventHandler.access$600(XWalkSettingsInternal.java:100)	at org.xwalk.core.internal.XWalkSettingsInternal.setAllowFileAccessFromFileURLs(XWalkSettingsInternal.java:371)	at com.yoren.canon.MainActivity.onXWalkReady(MainActivity.java:81)	at org.xwalk.core.XWalkActivity$2.run(XWalkActivity.java:122)	at org.xwalk.core.XWalkActivityDelegate.onActivateCompleted(XWalkActivityDelegate.java:179)	at org.xwalk.core.XWalkLibraryLoader$ActivateTask.onPostExecute(XWalkLibraryLoader.java:303)	at org.xwalk.core.XWalkLibraryLoader$ActivateTask.onPostExecute(XWalkLibraryLoader.java:266)	at android.os.AsyncTask.finish(AsyncTask.java:632)	at android.os.AsyncTask.access$600(AsyncTask.java:177)	at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:645)	at android.os.Handler.dispatchMessage(Handler.java:102)	at android.os.Looper.loop(Looper.java:136)	at android.app.ActivityThread.main(ActivityThread.java:5117)	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:785)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)	at dalvik.system.NativeStart.main(Native Method)