Fatal error: Uncaught Error: Class 'DOMDocument' not found in /var/www/html/piwigo/include/emogrifier.class.php:406 Stack trace: #0 /var/www/html/piwigo/include/emogrifier.class.php(233): Emogrifier->createXmlDocument() #1 /var/www/html/piwigo/include/functions_mail.inc.php(970): Emogrifier->emogrify() #2 /var/www/html/piwigo/include/functions_mail.inc.php(868): move_css_to_body() #3 /var/www/html/piwigo/include/functions_mail.inc.php(478): pwg_mail() #4 /var/www/html/piwigo/admin/include/updates.class.php(212): pwg_mail_admins() #5 /var/www/html/piwigo/include/page_tail.php(48): updates->notify_piwigo_new_versions() #6 /var/www/html/piwigo/identification.php(129): include('/var/www/html/p...') #7 {main} thrown in /var/www/html/piwigo/include/emogrifier.class.php on line 406