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$DropDownAdapter.getDropDownView(AppCompatSpinner.java:750)
	at androidx.appcompat.widget.AppCompatSpinner$DropDownAdapter.getView(AppCompatSpinner.java:744)
	at androidx.appcompat.widget.AppCompatSpinner.compatMeasureContentWidth(AppCompatSpinner.java:582)
	at androidx.appcompat.widget.AppCompatSpinner$DropdownPopup.computeContentWidth(AppCompatSpinner.java:1020)
	at androidx.appcompat.widget.AppCompatSpinner$DropdownPopup.show(AppCompatSpinner.java:1047)
	at androidx.appcompat.widget.AppCompatSpinner.showPopup(AppCompatSpinner.java:608)
	at androidx.appcompat.widget.AppCompatSpinner.performClick(AppCompatSpinner.java:452)
	at android.view.View.performClickInternal(View.java:7661)
	at android.view.View.-$$Nest$mperformClickInternal(Unknown Source:0)
	at android.view.View$PerformClick.run(View.java:30344)
	at android.os.Handler.handleCallback(Handler.java:1000)
	at android.os.Handler.dispatchMessage(Handler.java:104)
	at android.os.Looper.loopOnce(Looper.java:242)
	at android.os.Looper.loop(Looper.java:362)
	at android.app.ActivityThread.main(ActivityThread.java:8393)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:552)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:992)