Unable to connect to database server!
Warning: mysql_query(): Access denied for user ''@'localhost' (using password: NO) in /var/www/billing/docs/signup2/modules/engine/api.mysql.php on line 340

Warning: mysql_query(): A link to the server could not be established in /var/www/billing/docs/signup2/modules/engine/api.mysql.php on line 340
wrong data input: SELECT * from `sigreqconf`