I have followed same process to create the custom input type and getting below error: > Fatal error: Uncaught TypeError: Argument 2 passed to > Magento\Framework\View\Element\UiComponentFactory::arguments‌​Resolver() > must be of the type array, null given, called in > /var/www/html/envio/vendor/magento/framework/View/Element/Ui‌​ComponentFactory.php > on line 222 and defined in > /var/www/html/envio/vendor/magento/framework/View/Element/Ui‌​ComponentFactory.php‌​:174 > Stack trace: #0 > /var/www/html/envio/vendor/magento/framework/View/Element/Ui‌​ComponentFactory.php‌​(222): > Magento\Framework\View\Ele

Please refer the below override method: protected function _initTotals() { parent::_initTotals(); $source = $this->getSource(); $this->_totals['tax_amount'] = new \Magento\Framework\DataObject( [ 'code' => 'tax_amount', 'field' => 'tax_amount', 'strong' => false, 'value' => $source->getTaxAmount(), 'label' => __('Includes %1 GST','7%'), ] ); return $this; }

That's working but here one problem occured. When override the Block then Subtotal Include shipping feature not working. How can this manage?