Attempt to invoke virtual method void android.app.ActionBar on a null object reference android Error

Attempt to invoke virtual method void android.app.ActionBar on a null object reference android Error

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Attempt to Invoke Virtual Method androidx.appcompat.app.ActionBar.hide() on a Null Object Reference
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[SOLVED]Attempt To Invoke Virtual Method (OnClickListener) On a Null Object Reference

[SOLVED]Attempt To Invoke Virtual Method (OnClickListener) On a Null Object Reference