Warning: DOMDocument::loadHTMLFile(): php_network_getaddresses: getaddrinfo failed: No such host is known. in C:\xampp\apps\joomla\htdocs\calendar\headstart_calendar.php on line 9

Warning: DOMDocument::loadHTMLFile(https://calendar.google.com/calendar/embed?showTitle=0&showCalendars=0&showTz=0&height=600&wkst=1&bgcolor=%23ffffff&src=id8hhvfnptqkkrvou7pc9mrseo%40group.calendar.google.com&color=%235F6B02&src=en.usa%23holiday%40group.v.calendar.google.com&color=%23125A12&ctz=America%2FChicago): failed to open stream: php_network_getaddresses: getaddrinfo failed: No such host is known. in C:\xampp\apps\joomla\htdocs\calendar\headstart_calendar.php on line 9

Warning: DOMDocument::loadHTMLFile(): I/O warning : failed to load external entity "https://calendar.google.com/calendar/embed?showTitle=0&showCalendars=0&showTz=0&height=600&wkst=1&bgcolor=%23ffffff&src=id8hhvfnptqkkrvou7pc9mrseo%40group.calendar.google.com&color=%235F6B02&src=en.usa%23holiday%40group.v.calendar.google.com&color=%23125A12&ctz=America%2FChicago" in C:\xampp\apps\joomla\htdocs\calendar\headstart_calendar.php on line 9

Fatal error: Call to a member function getAttribute() on null in C:\xampp\apps\joomla\htdocs\calendar\headstart_calendar.php on line 12