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Attempt to invoke virtual method 'java.lang.String java.lang.Object.toString()' on a null object reference
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Attempt to invoke virtual method 'java.lang.String java.lang.Object.toString()' on a null object reference
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.AbsSpinner.onMeasure(AbsSpinner.java:197)	at android.widget.Spinner.onMeasure(Spinner.java:507)	at android.support.v7.widget.AppCompatSpinner.onMeasure(AppCompatSpinner.java:416)	at android.view.View.measure(View.java:17438)	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5464)	at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436)	at android.widget.LinearLayout.measureVertical(LinearLayout.java:722)	at android.widget.LinearLayout.onMeasure(LinearLayout.java:613)