Warning: mysqli_connect(): (HY000/2002): No such file or directory in /home/golfcour/public_html/electriciansfinder.co.uk/config.php on line 10

Warning: mysqli_error() expects parameter 1 to be mysqli, boolean given in /home/golfcour/public_html/electriciansfinder.co.uk/config.php on line 10
I cannot connect to the database because: