Не запускается процесс обновления MODX3

joxi.ru/Y2LjVGVTx4Wdjr

Fatal error: Uncaught Error: Call to undefined function mb_split() in /var/www/detective-poltava.com/www/core/vendor/smarty/smarty/libs/plugins/shared.mb_str_replace.php:47 Stack trace: #0 /var/www/detective-poltava.com/www/core/vendor/smarty/smarty/libs/plugins/modifier.replace.php(34): smarty_mb_str_replace('[[+current_year...', '2022', '© 2005-[[+...') #1 /var/www/detective-poltava.com/www/core/cache/setup/smarty/e7ce68fcfbd6d247a3d1e905d4bb546aadc5c54b_0.file.footer.tpl.php(37): smarty_modifier_replace('© 2005-[[+...', '[[+current_year...', '2022') #2 /var/www/detective-poltava.com/www/core/vendor/smarty/smarty/libs/sysplugins/smarty_template_resource_base.php(123): content_627b98b79fb783_83989882(Object(Smarty_Internal_Template)) #3 /var/www/detective-poltava.com/www/core/vendor/smarty/smarty/libs/sysplugins/smarty_template_compiled.php(114): Smarty_Template_Resource_Base->getRenderedTemplateCode(Object(Smarty_Internal_Template)) #4 /var/www/detective-poltava.com/www/core/vendor/smarty/smarty/libs/sysplugin in /var/www/detective-poltava.com/www/core/vendor/smarty/smarty/libs/plugins/shared.mb_str_replace.php on line 47

Подскажите пожалуйста куда копать?