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java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.lang.Object.toString()' on a null object reference	at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:394)	at android.widget.ArrayAdapter.getView(ArrayAdapter.java:362)	at android.widget.Spinner.measureContentWidth(Spinner.java:778)	at android.widget.Spinner.onMeasure(Spinner.java:529)	at android.view.View.measure(View.java:17496)	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5466)	at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1438)	at android.widget.LinearLayout.measureVertical(LinearLayout.java:724)	at android.widget.LinearLayout.onMeasure(LinearLayout.java:615)	at android.view.View.measure(View.java:17496)	at android.widget.ScrollView.measureChildWithMargins(ScrollView.java:1293)	at android.widget.FrameLayout.onMeasure(FrameLayout.java:430)	at android.widget.ScrollView.onMeasure(ScrollView.java:350)	at android.view.View.measure(View.java:17496)	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5466)	at android.widget.FrameLayout.onMeasure(FrameLayout.java:430)	at android.view.View.measure(View.java:17496)	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5466)	at android.widget.FrameLayout.onMeasure(FrameLayout.java:430)	at android.view.View.measure(View.java:17496)	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5466)	at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1438)	at android.widget.LinearLayout.measureVertical(LinearLayout.java:724)	at android.widget.LinearLayout.onMeasure(LinearLayout.java:615)	at android.view.View.measure(View.java:17496)	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5466)	at android.widget.FrameLayout.onMeasure(FrameLayout.java:430)	at android.view.View.measure(View.java:17496)	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5466)	at android.widget.FrameLayout.onMeasure(FrameLayout.java:430)	at android.view.View.measure(View.java:17496)	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5466)	at android.widget.FrameLayout.onMeasure(FrameLayout.java:430)	at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2636)	at android.view.View.measure(View.java:17496)	at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2031)	at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1168)	at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1400)	at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1078)	at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5885)	at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767)	at android.view.Choreographer.doCallbacks(Choreographer.java:580)	at android.view.Choreographer.doFrame(Choreographer.java:550)	at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753)	at android.os.Handler.handleCallback(Handler.java:739)	at android.os.Handler.dispatchMessage(Handler.java:95)	at android.os.Looper.loop(Looper.java:135)	at android.app.ActivityThread.main(ActivityThread.java:5376)	at java.lang.reflect.Method.invoke(Native Method)	at java.lang.reflect.Method.invoke(Method.java:372)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:908)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:703)