root@plesk:/var/log/plesk# cat panel.log
[2017-03-02 01:02:43] ERR [util_exec] proc_close() failed ['/opt/psa/admin/bin/filemng' 'xxx' 'exec' '/var/www/vhosts/xxx.actor' '/opt/psa/admin/plib/modules/wp-toolkit/vendor/wp-cli/wp-cli/bin/wp' '--path=/var/www/vhosts/xxx/httpdocs' 'core' 'config'...