Error #1040 en la línea 53

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/http/backend/includes/config.php
    [line:protected] => 53
    [trace:Exception:private] => Array
        (
            [0] => Array
                (
                    [file] => /home/http/backend/includes/config.php
                    [line] => 53
                    [function] => __construct
                    [class] => PDO
                    [type] => ->
                    [args] => Array
                        (
                            [0] => mysql:host=localhost;dbname=ivia_web
                            [1] => ivia_web
                            [2] => ivia*web$54
                        )

                )

            [1] => Array
                (
                    [file] => /home/http/backend/includes/config/lang.php
                    [line] => 68
                    [function] => connectDB
                    [class] => Cfg
                    [type] => ->
                    [args] => Array
                        (
                        )

                )

            [2] => Array
                (
                    [file] => /home/http/backend/includes/config/funs.php
                    [line] => 498
                    [function] => t
                    [args] => Array
                        (
                            [0] => Meteorología
                        )

                )

            [3] => Array
                (
                    [file] => /home/http/index.php
                    [line] => 299
                    [function] => draw_menu
                    [args] => Array
                        (
                            [0] => Array
                                (
                                    [/] => Inicio
                                    [investigacion-y-transferencia] => Array
                                        (
                                            [0] => Investigación y transferencia
                                            [equipo-humano] => Array
                                                (
                                                    [0] => Equipo humano
                                                )

                                            [proyectos] => Array
                                                (
                                                    [0] => Proyectos
                                                )

                                            [publicaciones] => Array
                                                (
                                                    [0] => Publicaciones
                                                )

                                        )

                                    [red-siar] => Array
                                        (
                                            [0] => Red SIAR
                                            [listado-de-estaciones] => Array
                                                (
                                                    [0] => Listado de estaciones
                                                )

                                            [modelos] => Array
                                                (
                                                    [0] => Modelos
                                                )

                                            [metodologia] => Array
                                                (
                                                    [0] => Metodología
                                                )

                                        )

                                    [meteorologia] => Array
                                        (
                                            [0] => Meteorología
                                            [datos-meteorologicos] => Array
                                                (
                                                    [0] => Datos meteorológicos
                                                )

                                            [episodios-meteorologicos] => Array
                                                (
                                                    [0] => Episodios meteorológicos
                                                )

                                            [calculo-de-integral-termica] => Array
                                                (
                                                    [0] => Cálculo de integral térmica
                                                )

                                            [calculo-de-horas-frio] => Array
                                                (
                                                    [0] => Cálculo de horas frío
                                                )

                                            [resumenes] => Array
                                                (
                                                    [0] => Resúmenes
                                                )

                                            [datos-diarios] => Array
                                                (
                                                    [0] => Datos diarios
                                                )

                                        )

                                    [necesidades-de-riego] => Array
                                        (
                                            [0] => Necesidades de riego
                                            [calculo-de-necesidades-de-riego] => Array
                                                (
                                                    [0] => Cálculo de necesidades de riego
                                                )

                                            [programacion-anual-orientativa] => Array
                                                (
                                                    [0] => Programación anual orientativa
                                                )

                                            [red-de-sondas] => Array
                                                (
                                                    [0] => Red de sondas
                                                )

                                            [recomendaciones] => Array
                                                (
                                                    [0] => Recomendaciones
                                                )

                                            [cartografia] => Array
                                                (
                                                    [0] => Cartografía
                                                )

                                        )

                                    [servicios] => Array
                                        (
                                            [0] => Servicios
                                            [datos-agroclimaticos] => Array
                                                (
                                                    [0] => Datos agroclimáticos
                                                )

                                            [consultas-y-sugerencias] => Array
                                                (
                                                    [0] => Consultas y sugerencias
                                                )

                                            [descargas] => Array
                                                (
                                                    [0] => Descargas
                                                )

                                            [alta-de-usuarios] => Array
                                                (
                                                    [0] => Alta de usuarios
                                                )

                                        )

                                    [noticias-y-avisos] => Array
                                        (
                                            [0] => Noticias y avisos
                                            [noticias] => Array
                                                (
                                                    [0] => Noticias
                                                )

                                            [avisos] => Array
                                                (
                                                    [0] => Avisos
                                                )

                                        )

                                )

                            [1] => menu_principal
                            [2] => listado-de-estaciones/picassent
                            [3] => Array
                                (
                                    [rootonly] => 
                                    [translate] => 1
                                )

                        )

                )

        )

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