error.log
[01-Apr-2018 00:33:16 Europe/Warsaw] PHP Warning: htmlspecialchars(): charset `iso-8859-2' not supported, assuming utf-8 in /home/www/public_html/program/lib/Roundcube/rcube_washtml.php on line 491
[01-Apr-2018 00:33:16 Europe/Warsaw] PHP Warning: html_entity_decode(): charset `iso-8859-2' not supported, assuming utf-8 in /home/www/public_html/program/lib/Roundcube/rcube_utils.php on line 501
config.inc.php
$config['default_charset'] = 'UTF-8';
What should I correct ?