Error #1040 en la línea 54

SQLSTATE[08004] [1040] Too many connections
PDOException Object
(
    [message:protected] => SQLSTATE[08004] [1040] Too many connections
    [string:Exception:private] => 
    [code:protected] => 1040
    [file:protected] => /home/artemadr/public_html/backend/includes/config.php
    [line:protected] => 54
    [trace:Exception:private] => Array
        (
            [0] => Array
                (
                    [file] => /home/artemadr/public_html/backend/includes/config.php
                    [line] => 54
                    [function] => __construct
                    [class] => PDO
                    [type] => ->
                    [args] => Array
                        (
                            [0] => mysql:host=localhost;dbname=artemadr_web
                            [1] => artemadr_web
                            [2] => CPsimart*418
                        )

                )

            [1] => Array
                (
                    [file] => /home/artemadr/public_html/backend/includes/api/misc.php
                    [line] => 71
                    [function] => connectDB
                    [class] => Cfg
                    [type] => ->
                    [args] => Array
                        (
                        )

                )

            [2] => Array
                (
                    [file] => /home/artemadr/public_html/index.php
                    [line] => 24
                    [function] => get_config
                    [args] => Array
                        (
                            [0] => menu_principal
                        )

                )

        )

    [previous:Exception:private] => 
    [errorInfo] => 
)