Object DOMDocument should be created.

namespace TechnoAreaBlockArea;

use TechnoAreaBlockBaseBlock;
use TechnoAreaModelArea as AreaModel;
use TechnoAreaModelStatus;

class Index extends BaseBlock {

protected $_areaFactory;
protected $_area;
protected $_areaCollectionFactory;
protected $_areaHelper;

public function __construct(
MagentoFrameworkViewElementTemplateContext $context
TechnoAreaModelResourceModelAreaCollectionFactory $areaCollectionFactory,
TechnoAreaModelAreaFactory $areaFactory,
AreaModel $area,
TechnoAreaHelperData $areaHelper
) {
    parent::__construct($context);
    $this->_areaFactory = $areaFactory;
    $this->_area = $area;
    $this->_areaCollectionFactory = $areaCollectionFactory;
    $this->_areaHelper = $areaHelper;
}


public function getAreaCollection() {
    $areaCollection = $this->_areaCollectionFactory->create()
            ->addFieldToFilter('status', Status::STATUS_ENABLED)
            ->setOrder('area_name', 'ASC');

    return $areaCollection;
}

}