Fatal error: Uncaught Error: Class "DOMDocument" not found in /var/www/photo/include/emogrifier.class.php:406
Stack trace:
#0 /var/www/photo/include/emogrifier.class.php(233): Emogrifier->createXmlDocument()
#1 /var/www/photo/include/functions_mail.inc.php(970): Emogrifier->emogrify()
#2 /var/www/photo/include/functions_mail.inc.php(868): move_css_to_body()
#3 /var/www/photo/include/functions_mail.inc.php(478): pwg_mail()
#4 /var/www/photo/admin/include/updates.class.php(210): pwg_mail_admins()
#5 /var/www/photo/include/page_tail.php(48): updates->notify_piwigo_new_versions()
#6 /var/www/photo/index.php(374): include('...')
#7 {main}
thrown in /var/www/photo/include/emogrifier.class.php on line 406