Why is form_validation not working?

Question

CodeIgniter

Hello. I use the codeigniter framework and its built-in form validation class. I also use the jqueryvalidation.org library on the frontend side. Without this library, validation on the codeginiter side works, but not with it.
Ajax send code example:

$('#button-l-p-auth').click(function() {
    $.ajax({
        url: '/auth/auth_user',
        dataType: "json",
        type: 'POST',
        data: $('form-l-p-auth').serialize(),
        success: function (response) {
            if (response.status == 'error') {
                $('#form-l-p-auth-response').empty();
                $('#form-l-p-auth-response').append(response.message);
            } else if(response.status == 'success') {
                window.location.href = response.redirect;
            }
        }
    });
});

Validation:

$(document).ready(function () {
    $("#form-l-p-auth").validate({
        rules: {
            email: {
                required: true,
                minlength: 4
            },
            password: {
                required: true,
                minlength: 6
            },
        },
        messages: {
            email: {
                required: "This field can't be blank.",
                minlength: "Please enter a valid email address."
            },
            password: {
                required: "This field can't be blank.",
                minlength: "Password has to be 6 symbols min."
            },
        }
    });
});

I accept on the server:

public function auth_user()
  {
    if ($this->form_validation->run()) {
      $email = $this->input->post('email');
      $password = $this->input->post('password');

      $data_user = $this->auth_model->get_data_user($email);
      if ($data_user->num_rows() > 0) {

        $data_user = $data_user->row();
        $hash_pass_tmp = crypt($password, $data_user->hash_pass);
        if ($data_user->hash_pass == $hash_pass_tmp) {
          $auth_data = array(
            'id' => $data_user->id,
            'email' => $data_user->email,
            'logged' => TRUE
          );
          $this->session->set_userdata($auth_data);
          $data = array(
            'status' => 'success',
            'redirect' => base_url('apps')
          );
          print(json_encode($data));
        } else {
          $data = array(
            'status' => 'error',
            'message' => 'Wrong password'
          );
          print(json_encode($data));
        }
      } else {
        $data = array(
          'status' => 'error',
          'message' => 'Unrecognised email'
        );
        print(json_encode($data));
      }
    } else {
      $data = array(
        'status' => 'error',
        'message' => 'This field can\'t be blank.'
      );
      print(json_encode($data));
    }
  }

Server side validation:

'auth/auth_user' => array(
    array(
      'field' => 'password',
      'label' => 'Password user',
      'rules' => 'trim|required|min_length[6]'
    ),
    array(
      'field' => 'email',
      'label' => 'Email user',
      'rules' => 'trim|required|valid_email'
    )
  ),

Submission form:

<form class="form-horizontal" id="form-l-p-auth" method="post" accept-charset="utf-8">
              <div class="form-group">
                <div class="col-lg-12">
                  <input type="email" class="form-control" id="email" name="email"
                         placeholder="Email">
                </div>
              </div>
              <div class="form-group">
                <div class="col-lg-12">
                  <input type="password" class="form-control" id="password" name="password"
                         placeholder="Password">
                </div>
              </div>
              <div class="form-group">
                <div class="col-lg-12 form-l-p-auth">
                  <span id="form-l-p-auth-response"></span>
                </div>
              </div>
              <div class="form-group">
                <div class="col-lg-12">
                  <button type="button" class="btn btn-success" id="button-l-p-auth">Submit</button>
                </div>
              </div>
            </form>

It is still not clear why, but there is no data sent by the chromium debbugger:

It is the codeigniter validation class that returns the error in the response. Those. "This field can\'t be blank.". I don't know why.
I suppose that it is wrong or not at all to serialize data from the form.

Answer 1

Question removed. I forgot to add # to form id when sending ajax request.