Hello,

I recieve this error:
Fatal error: Call to undefined method XenForo_Helper_DevelopmentXml::processSimpleXmlCdata() in /home/downupsi/public_html/library/EWRporta/Model/Templates.php on line 58

With this code:

<?php

class EWRporta_Model_Templates extends XenForo_Model
{
	public function getTemplatesByBlock($blockId, $styleId = 0);
	{
		$title = 'EWRblock_'.$blockId;

		return $this->fetchAllKeyed('
			SELECT *
				FROM xf_template
			WHERE title LIKE ?
				AND style_id = ?
		', 'title', array($title.'%', $styleId));
	}

	public function getAdminTemplatesByBlock($blockId)
	{
		$title = 'EWRblock_'.$blockId;

		return $this->fetchAllKeyed('
			SELECT *
				FROM xf_admin_template
			WHERE title LIKE ?
		', 'title', $title.'%');
	}

	public function deleteTemplatesByBlock($blockId)
	{
		$title = 'EWRblock_'.$blockId;

		$db = $this->_getDb();
		$db->delete('xf_template', 'style_id = 0 AND title LIKE ' . $db->quote($title.'%'));
		$db->delete('xf_admin_template', 'title LIKE ' . $db->quote($title.'%'));

		return;
	}

	public function importTemplatesXml(SimpleXMLElement $xml, $blockId)
	{
		$existingTemplates = $this->getTemplatesByBlock($blockId);

		$db = $this->_getDb();
		XenForo_Db::beginTransaction($db);

		foreach ($xml->template AS $template)
		{
			$templateName = (string)$template['title'];

			$dw = XenForo_DataWriter::create('XenForo_DataWriter_Template');
			if (isset($existingTemplates[$templateName]))
			{
				$dw->setExistingData($existingTemplates[$templateName], true);
			}
			$dw->bulkSet(array(
				'style_id' => '0',
				'title' => $templateName,
				'template' => XenForo_Helper_DevelopmentXml::processSimpleXmlCdata($template),
));
			$dw->save();
		}

		XenForo_Db::commit($db);

		return;
	}

	public function importAdminTemplatesXml(SimpleXMLElement $xml, $blockId)
	{
		$existingAdminTemplates = $this->getAdminTemplatesByBlock($blockId);

		$db = $this->_getDb();
		XenForo_Db::beginTransaction($db);

		foreach ($xml->template AS $template)
		{
			$templateName = (string)$template['title'];

			$dw = XenForo_DataWriter::create('XenForo_DataWriter_AdminTemplate');
			if (isset($existingAdminTemplates[$templateName]))
			{
				$dw->setExistingData($existingAdminTemplates[$templateName], true);
			}
			$dw->bulkSet(array(
				'title' => $templateName,
				'template' => XenForo_Helper_DevelopmentXml::processSimpleXmlCdata($template),
			));
			$dw->save();
		}

		XenForo_Db::commit($db);

		return;
	}

	public function appendTemplatesXml(DOMElement $rootNode, $blockId)
	{
		$document = $rootNode->ownerDocument;

		$templates = $this->getTemplatesByBlock($blockId);
		foreach ($templates AS $template)
		{
			$templateNode = $document->createElement('template');
			$templateNode->setAttribute('title', $template['title']);
			$templateNode->appendChild(XenForo_Helper_DevelopmentXml::createDomCdataSection($document, $template['template']));

			$rootNode->appendChild($templateNode);
		}
	}

	public function appendAdminTemplatesXml(DOMElement $rootNode, $blockId)
	{
		$document = $rootNode->ownerDocument;

		$adminTemplates = $this->getAdminTemplatesByBlock($blockId);
		foreach ($adminTemplates AS $template)
		{
			$templateNode = $document->createElement('template');
			$templateNode->setAttribute('title', $template['title']);
			$templateNode->appendChild(XenForo_Helper_DevelopmentXml::createDomCdataSection($document, $template['template']));

			$rootNode->appendChild($templateNode);
		}
	}
}

Please can you help me fix it, as I've no clue whats wrong.
Thanks

It seems the mentioned method is not available in current file. Check if you've included all files especially the file contaning 'XenForo_Helper_DevelopmentXml' class