Thank you so much for you prompt reply, I'm so nervous because this is my commercial server. Here's my output:
[root@mail sbin]# /usr/local/psa/bin/sw-engine-pleskrun /usr/local/psa/admin/plib/DailyMaintainance/script.php -f ExecuteStatistics
[Thu, 21 Aug 2014 12:02:42 +0700] ! 0 Task named...