Fatal error: Uncaught Error: Class 'DOMDocument' not found in /usr/share/piwigo-fotogra4/include/emogrifier.class.php:406 Stack trace: #0 /usr/share/piwigo-fotogra4/include/emogrifier.class.php(233): Emogrifier->createXmlDocument() #1 /usr/share/piwigo-fotogra4/include/functions_mail.inc.php(970): Emogrifier->emogrify() #2 /usr/share/piwigo-fotogra4/include/functions_mail.inc.php(868): move_css_to_body() #3 /usr/share/piwigo-fotogra4/include/functions_mail.inc.php(478): pwg_mail() #4 /usr/share/piwigo-fotogra4/admin/include/updates.class.php(220): pwg_mail_admins() #5 /usr/share/piwigo-fotogra4/include/page_tail.php(48): updates->notify_piwigo_new_versions() #6 /usr/share/piwigo-fotogra4/picture.php(1036): include('/usr/share/piwi...') #7 {main} thrown in /usr/share/piwigo-fotogra4/include/emogrifier.class.php on line 406