Fatal error: Uncaught ArgumentCountError

Can you give me a hand with this error? I'm new to this ..

  

Fatal error: Uncaught ArgumentCountError: Too few arguments to   function Base :: bind (), 2 passed in   C: \ xampp \ htdocs \ guiacordoba \ app \ models \ User.php online 21 and   exactly 3 expected in   C: \ xampp \ htdocs \ guiacordoba \ app \ libraries \ Base.php: 39 Stack trace: # 0   C: \ xampp \ htdocs \ guiacordoba \ app \ models \ User.php (21):   Base-> bind (': name', 'jhghj') # 1   C: \ xampp \ htdocs \ guiacordoba \ app \ drivers \ Pages.php (27):   User-> addUser (Array) # 2   C: \ xampp \ htdocs \ guiacordoba \ app \ libraries \ Core.php (51):   Pages-> add () # 3 C: \ xampp \ htdocs \ guiacordoba \ public \ index.php (6):   Core-> __ construct () # 4 {main} thrown in   C: \ xampp \ htdocs \ guiacordoba \ app \ libraries \ Base.php on line 39

Base.php

<?php

  //Clase para conectarse a la base de datos y ejecutar consultas PDO
  class Base{
    private $host = DB_HOST;
    private $usuario = DB_USUARIO;
    private $password = DB_PASSWORD;
    private $db_nombre = DB_NOMBRE;

    private $dbh;
    private $stmt;
    private $error;

    public function __construct(){
      //configurar conexion
      $dsn = 'mysql:host=' . $this->host . ';dbname=' .$this->db_nombre;

      $opciones = array(
        PDO::ATTR_PERSISTENT => true,
        PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION
      );

      //Crear una instancia de PDO
      try {
          $this->dbh = new PDO($dsn, $this->usuario, $this->password, $opciones);
          $this->dbh->exec('set names utf8');

      } catch (PDOException $e) {
          $this->error = $e->getMessage();
          echo $this->error;
      }
    }

    //Preparamos la consulta
    public function query($sql){
      $this->stmt = $this->dbh->prepare($sql);
    }

    //Vinculamos la consulta con bind
    public function bind($parametro, $valor, $tipo){
      if (is_null($tipo)) {
        switch (true) {
          case is_int($valor):
            $tipo = PDO::PARAM_INT;
          break;
          case is_bool($valor):
            $tipo = PDO::PARAM_BOOL;
          break;
          case is_null($valor):
            $tipo = PDO::PARAM_NULL;
          break;
          default:
            $tipo = PDO::PARAM_STR;
          break;
        }
      }
      $this->stmt->bindValue($parametro, $valor, $tipo);
    }

    //Ejecuta la consulta
    public function execute(){
      return $this->stmt->execute();
    }

    //Obtener los registros de la consulta
    public function registros(){
      $this->execute();
      return $this->stmt->fetchAll(PDO::FETCH_OBJ);
    }

    //Obtener un unico registro
    public function registro(){
      $this->execute();
      return $this->stmt->fetch(PDO::FETCH_OBJ);
    }

    //Obtener cantidad de filas con el metodo rowCount
    public function rowCount(){
      return $this->stmt->rowCount();
    }
  }

User.php

<?php

  class Usuario{
    private $db;

    public function __construct(){
      $this->db = new Base;
    }

    public function obtenerUsuarios(){
      $this->db->query('SELECT * FROM clientes');

      $resultados = $this->db->registros();

      return $resultados;
    }

    public function agregarUsuario($datos){
      $this->db->query('INSERT INTO clientes (nombre, email, telefono) VALUES (:nombre, :email, :telefono)');

      $this->db->bind(':nombre', $datos['nombre']);
      $this->db->bind(':email', $datos['email']);
      $this->db->bind(':telefono', $datos['telefono']);

      if ($this->db->execute()) {
        return true;
      }else{
        return false;
      }
    }
  }

I hope you can help me, thank you very much!