What is simpleXML ?
SimpleXML is an extension which allows us to easily handle mechanism and retrieve XML data.
SimpleXML turns an XML document into a data structure you can iterate through like a collection of arrays and objects.
SimpleXMLElement error :
it requires certain extension to be installed on server otherwise you may get error such as ‘SimpleXMLElement Not Found Error ‘.
if you get those errors please simply install php-xml, php-simplexml that should sort the issue for you page.