ERROR [2] mysqli::__construct(): (HY000/2002): Connection refused

  Fatal error in line 13 of file /var/www/vhosts/venezia-help.com/httpdocs/classes/c_mw_database.php, PHP 7.3.33 (Linux)

This is the debug trace



Notice:  Undefined index: line in /var/www/vhosts/venezia-help.com/httpdocs/lib/mw_error_handler.php on line 19



Notice:  Undefined index: file in /var/www/vhosts/venezia-help.com/httpdocs/lib/mw_error_handler.php on line 19

Error: "mysqli::__construct(): (HY000/2002): Connection refused" (error #2).
Backtrace:
  0: myErrorHandler (line  in )
  1: __construct (line 13 in /var/www/vhosts/venezia-help.com/httpdocs/classes/c_mw_database.php)
  2: __construct (line 33 in /var/www/vhosts/venezia-help.com/httpdocs/classes/c_cms.php)
  3: __construct (line 24 in /var/www/vhosts/venezia-help.com/httpdocs/classes/c_cms.php)
  4: include (line 3 in /var/www/vhosts/venezia-help.com/httpdocs/index_mw.php)
Variables in myErrorHandler ():
  dbHost is NULL
  dbUser is NULL
  dbPass is NULL
  dbName is NULL
  charset is utf8mb4
Client IP: 172.71.255.139
Aborting...