<br />
<b>Fatal error</b>:  Uncaught Error: Call to undefined function mb_convert_encoding() in /var/www/piwigo/include/emogrifier.class.php:434
Stack trace:
#0 /var/www/piwigo/include/emogrifier.class.php(411): Emogrifier-&gt;getUnifiedHtml()
#1 /var/www/piwigo/include/emogrifier.class.php(233): Emogrifier-&gt;createXmlDocument()
#2 /var/www/piwigo/include/functions_mail.inc.php(963): Emogrifier-&gt;emogrify()
#3 /var/www/piwigo/include/functions_mail.inc.php(861): move_css_to_body('&lt;!DOCTYPE html ...')
#4 /var/www/piwigo/include/functions_mail.inc.php(473): pwg_mail(Array, Array, Array)
#5 /var/www/piwigo/admin/include/updates.class.php(221): pwg_mail_admins(Array, Array, false, true)
#6 /var/www/piwigo/include/page_tail.php(63): updates-&gt;notify_piwigo_new_versions()
#7 /var/www/piwigo/include/functions.inc.php(898): include('/var/www/piwigo...')
#8 /var/www/piwigo/include/functions_html.inc.php(299): redirect_html('identification....')
#9 /var/www/piwigo/include/functions_category.inc.php(59): access_denied()
#10 /var/www/piwigo/index.php(36) in <b>/var/www/piwigo/include/emogrifier.class.php</b> on line <b>434</b><br />