For running J!5.1 you must https://fabrikar.com/forums/index.php?wiki/update-from-github/ or include the new file manually https://fabrikar.com/forums/index.php?threads/joomla-5-1-and-fabrik-cannot-find-files-error.54473/post-285151 See also Announcements
Please see our announcement here.
$elementarray = $formModel->formData['data_repeat_table___element'];
$elementsum = array_sum($itemcostget);
$formModel->updateFormData('data_table___calculation', $elementsum, true);
$vtotalarray = $formModel->formData['jie_pedidos_18_repeat___v_total'];
$vtotalsum = array_sum($vtotalarray);
$formModel->updateFormData('jie_pedidos___calculation', $vtotalsum, true);
$vtotalarray = $formModel->formData['jie_pedidos_18_repeat___v_total'];
$vtotalsum = array_sum($vtotalarray);
echo "<pre>";print_r($vtotalsum);exit;
$formModel->updateFormData('jie_pedidos___calculation', $vtotalsum, true);