erroCodeIgniter

<script>
    $("#logar").click(function(event) {
      event.preventDefault();
      var email = $('#emailL').val();
      var senha = $('#passwordL').val();
      var url = "<?= base_url("login/autenticar"); ?>";
      $.post(url,{
        email : email,
        async: true,
        password : senha
      }, function(event){
        if(event === "1"){
          $('#erroEmail').html("<img src='<?= base_url('img/l568ECv.gif')?>'' alt='' id='imgLoad'>");
          $('#imgLoad').show();
          setTimeout(function(){
           window.location ="<?= base_url('edit') ?>";
         }, 3000);

        }else{
          $('#erroEmail').html(event);
        }
      });
    });

  </script>



public function autenticar() {
        $this->load->model("cadastro_model");
        $email = $this->input->post("email");
        $senha = md5($this->input->post("password"));
        $usuario = $this->cadastro_model->buscaPorEmailESenha($email, $senha);
        if($usuario) {
            $this->session->set_userdata("logado" , $usuario);
            echo "1";
            die();
        } else {
            echo "<i class='material-icons alinhaIcone margenIcone'>thumb_down</i>Login or password invalid.";
            die();
        }

    }