Error when trying to get property from parent class

Change it from private to protected.

public
scope to make that property/method available from anywhere, other classes and instances of the object.

private
scope when you want your property/method to be visible in its own class only.

protected
scope when you want to make your property/method visible in all classes that extend current class including the parent class.

What did you Try? What did you Get? What did you Expect?

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