VITCIE info: Can not connect to MySQL server

Time: 2018-8-17 10:01am
Script: /classroomviewdoc.php

Error: Lost connection to MySQL server at 'reading initial communication packet', system error: 111
Errno.: 2013

An error report has been dispatched to our administrator.
Fatal error: Call to undefined function sendmail() in /data/home/hyu3102420001/htdocs/include/db_mysql_error.php on line 51