Warning: mysqli::mysqli(): (HY000/2002): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2) in /usr/lib/php/connect_aitt_mysqli.php on line 2

Call Stack:
    0.0024     553184   1. {main}() /home/tourworld/tourtravelworld.com/htdocs/script-files/travel-agents-htaccess/index.php:0
    0.0025     559896   2. include_once('/home/tourworld/tourtravelworld.com/htdocs/config-mysqli.php') /home/tourworld/tourtravelworld.com/htdocs/script-files/travel-agents-htaccess/index.php:26
    0.0102    1071256   3. require('/usr/lib/php/connect_aitt_mysqli.php') /home/tourworld/tourtravelworld.com/htdocs/config-mysqli.php:20
    0.0102    1071848   4. mysqli->mysqli() /usr/lib/php/connect_aitt_mysqli.php:2

Connect Error (2002) Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)