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:454)
	at android.widget.ArrayAdapter.getDropDownView(ArrayAdapter.java:502)
	at androidx.appcompat.widget.AppCompatSpinner$d.getDropDownView(Unknown Source:6)
	at androidx.appcompat.widget.AppCompatSpinner$d.getView(Unknown Source:0)
	at androidx.appcompat.widget.AppCompatSpinner.a(Unknown Source:61)
	at androidx.appcompat.widget.AppCompatSpinner$e.O(Unknown Source:79)
	at androidx.appcompat.widget.AppCompatSpinner$e.n(Unknown Source:4)
	at androidx.appcompat.widget.AppCompatSpinner.b(Unknown Source:10)
	at androidx.appcompat.widget.AppCompatSpinner.performClick(Unknown Source:10)
	at android.view.View.performClickInternal(View.java:7755)
	at android.view.View.-$$Nest$mperformClickInternal(Unknown Source:0)
	at android.view.View$PerformClick.run(View.java:30734)
	at android.os.Handler.handleCallback(Handler.java:1013)
	at android.os.Handler.dispatchMessage(Handler.java:101)
	at android.os.Looper.loopOnce(Looper.java:226)
	at android.os.Looper.loop(Looper.java:328)
	at android.app.ActivityThread.main(ActivityThread.java:9223)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:594)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)