Warning: DOMDocument::loadHTMLFile(): php_network_getaddresses: getaddrinfo failed: No such host is known. in C:\xampp\apps\joomla\htdocs\calendar\mpcc_calendar.php on line 8

Warning: DOMDocument::loadHTMLFile(https://calendar.google.com/calendar/embed?showTitle=0&showPrint=0&showTz=0&height=600&wkst=1&bgcolor=%23FFFFFF&src=4o3tu8u1830g5o5650o650ri38%40group.calendar.google.com&color=%23853104&src=1lrimuiisbssol10h9jfcunrt8%40group.calendar.google.com&color=%23711616&ctz=America%2FChicago): failed to open stream: php_network_getaddresses: getaddrinfo failed: No such host is known. in C:\xampp\apps\joomla\htdocs\calendar\mpcc_calendar.php on line 8

Warning: DOMDocument::loadHTMLFile(): I/O warning : failed to load external entity "https://calendar.google.com/calendar/embed?showTitle=0&showPrint=0&showTz=0&height=600&wkst=1&bgcolor=%23FFFFFF&src=4o3tu8u1830g5o5650o650ri38%40group.calendar.google.com&color=%23853104&src=1lrimuiisbssol10h9jfcunrt8%40group.calendar.google.com&color=%23711616&ctz=America%2FChicago" in C:\xampp\apps\joomla\htdocs\calendar\mpcc_calendar.php on line 8

Fatal error: Call to a member function getAttribute() on null in C:\xampp\apps\joomla\htdocs\calendar\mpcc_calendar.php on line 11