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

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  2. Attempt to invoke virtual method void android.app.ActionBar on a null object reference android Error
  3. Attempt to invoke virtual method 'void androidx.appcompat.app.ActionBar.setDisplayHomeAsUpEnabled
  4. Android Error Attempt to invoke virtual method void android.app.ActionBar on a null object reference
  5. Attempt to invoke virtual method 'void android.app.ActionBar
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