Warning: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2) in /home/virtual/site48/fst/var/www/html/gallery/pp-inc.php on line 55

Warning: MySQL Connection Failed: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2) in /home/virtual/site48/fst/var/www/html/gallery/pp-inc.php on line 55
I cannot connect to the PhotoPost database. [$php_errormsg]