def METHOD_NAME(self):
    # Provide an annotation in the view for error notifications
    self.error_label = NSTextField.alloc().init()
    self.error_label.drawsBackground = False
    self.error_label.editable = False
    self.error_label.bezeled = False
    self.error_label.hidden = True
    self.error_label.translatesAutoresizingMaskIntoConstraints = False
    self.error_label.stringValue = "\u26a0"  # Warning sign
    self.error_label.textColor = NSColor.systemRedColor
    self.native.addSubview(self.error_label)
    leading_constraint = NSLayoutConstraint.constraintWithItem_attribute_relatedBy_toItem_attribute_multiplier_constant_(  # noqa: E501
        self.native,
        NSLayoutAttributeLeading,
        NSLayoutRelationEqual,
        self.error_label,
        NSLayoutAttributeLeading,
        1.0,
        4.0,
    )
    trailing_constraint = NSLayoutConstraint.constraintWithItem_attribute_relatedBy_toItem_attribute_multiplier_constant_(  # noqa: E501
        self.native,
        NSLayoutAttributeTrailing,
        NSLayoutRelationEqual,
        self.error_label,
        NSLayoutAttributeTrailing,
        1.0,
        4.0,
    )
    center_y_constraint = NSLayoutConstraint.constraintWithItem_attribute_relatedBy_toItem_attribute_multiplier_constant_(  # noqa: E501
        self.error_label,
        NSLayoutAttributeCenterY,
        NSLayoutRelationEqual,
        self.native,
        NSLayoutAttributeCenterY,
        1.0,
        0.0,
    )
    self.native.addConstraints(
        [
            leading_constraint,
            trailing_constraint,
            center_y_constraint,
        ]
    )