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Warning: mysqli_connect(): Error while reading greeting packet. PID=21691 in /Svc/webroot/lec.sch.ac.kr/public_html_work/lib/common.lib.php on line 1435

Warning: mysqli_connect(): (HY000/2006): MySQL server has gone away in /Svc/webroot/lec.sch.ac.kr/public_html_work/lib/common.lib.php on line 1435
Connect Error: MySQL server has gone away