java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at crc.carsapp.activities.RootActivity.onRestart(RootActivity.java:473)
at android.app.Instrumentation.callActivityOnRestart(Instrumentation.java:1181)
at android.app.Activity.performRestart(Activity.java:5192)
at android.app.Activity.performResume(Activity.java:5203)
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2780)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2819)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1298)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5103)
at java.lang.reflect.Method.invokeNative(Method.java)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(NativeStart.java)

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