问laravel不上传图片

EN

<?php

namespace App\Http\Controllers\Auth;

use App\User;
use App\Role;
use App\Actserv;
use App\Http\Controllers\Controller;
use Illuminate\Support\Facades\Validator;
use Illuminate\Foundation\Auth\RegistersUsers;
use Webcraft\Random\RandomFacade;

class RegisterController extends Controller
{

use RegistersUsers;

/**
 * Where to redirect users after registration.
 *
 * @var string
 */
protected $redirectTo = '/home';

/**
 * Create a new controller instance.
 *
 * @return void
 */
public function __construct()
{
    $this->middleware('guest');
}

/**
 * Get a validator for an incoming registration request.
 *
 * @param  array  $data
 * @return \Illuminate\Contracts\Validation\Validator
 */
protected function validator(array $data)
{
    return Validator::make($data, [
        //'name' => 'required|string|max:255',
        'email' => 'required|string|email|min:6|max:128|unique:users',
        'password' => 'required|string||min:6|max:128|confirmed',
        'nombre_empresa' => 'required|string|unique:users|min:1|max:255',
        'pais' => 'required|string|not_in:Opción no seleccionada|max:128',
        'tipo' => 'required|string|not_in:Opción no seleccionada|max:128',
        'ciudad' => 'required|string|min:1|max:200',
        'direccion' => 'required|string|min:1|max:255',
        'telefono' => 'nullable|numeric',
        'celular_e' => 'required|unique:users|numeric',
        'postal' => 'nullable|string|min:1|max:128',
        'nit' => 'nullable|unique:users|numeric|min:1',
        'web' => 'nullable|string|min:1|max:255',
        'facebook' => 'nullable|string|min:1|max:255',
        'oferta' => 'required|string|min:1|max:255',
        'demanda' => 'required|string|min:1|max:255',
        'nombre_r' => 'required|string|min:1|max:128',
        'ci' => 'required|unique:users|numeric',
        'email_r' => 'required|unique:users|string|email|min:1|max:128',
        'cargo' => 'required|string|min:1|max:128',
        'celular_r' => 'required|numeric|unique:users',
        //--------------------------------------------
        //field that validates the logo---------------
        'logo' => 'nullable|image|mimes:jpg,bmp,png',
        //--------------------------------------------
        'actv'  => 'required|array|min:1',
        'actv.0'  => 'required|string|not_in:Opción no seleccionada|max:255',
        'actv.1'  => 'string|max:255',
        'actv.2'  => 'string|max:255',

        'srv' => 'required|array|min:1',
        'srv.0' => 'required|string|not_in:Opción no seleccionada|max:255',
        'srv.1' => 'string|max:255',
        'srv.2' => 'string|max:255', 
    ]);    
}


/**
 * Create a new user instance after a valid registration.
 *
 * @param  array  $data
 * @return \App\User
 */


protected function create(array $data)
{

    $cod = RandomFacade::generateString(6, '1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ'); //se genera un unico codigo por cada usuario registrado
    $user = User::create([
        'email' => $data['email'],
        'password' => bcrypt($data['password']),
        'nombre_empresa' => $data['nombre_empresa'],
        'pais' => $data['pais'],
        'tipo' => $data['tipo'],
        'ciudad' => $data['ciudad'],
        'direccion' => $data['direccion'],
        'telefono' => $data['telefono'],
        'celular_e' => $data['celular_e'],
        'postal' => $data['postal'],
        'nit' => $data['nit'],
        'web' => $data['web'],
        'facebook' => $data['facebook'],
        'oferta' => $data['oferta'],
        'demanda' => $data['demanda'],
        'nombre_r' => $data['nombre_r'],
        'ci' => $data['ci'],
        'email_r' => $data['email_r'],
        'cargo' => $data['cargo'],
        'celular_r' => $data['celular_r'],
        'estado' => '0', //indica si el usuario esta activo(1) o inactivo(0)
        'tipo_user' => 'user',//indica que tipo de usuario es user=usuario normal admin=usuario administrador local=usuario designado por el admin
        'codigo' => $cod,
    ]);

    $actividad = $data['actv'];
    $servicios = $data['srv'];


    $actserv = Actserv::create([
        'emp_id' => $user->id,
        'actividad' => $actividad[0],
        'servicios' => $servicios[0],
    ]);
    $actserv = Actserv::create([
            'emp_id' => $user->id,
            'actividad' => $actividad[1],
            'servicios' => $servicios[1],
    ]);
    $actserv = Actserv::create([
        'emp_id' => $user->id,
        'actividad' => $actividad[2],
        'servicios' => $servicios[2],
    ]);

    $user
    ->roles()
    ->attach(Role::where('name', 'user')->first());

    return $user;   
}
}

 <form id="needs-validation" novalidate method="post" enctype=”multipart/form-data”>
 ...
   <label for="logo">Logo</label>
   <input type="file" class="form-control-file"  name="logo" id="logo">
 ...
 </form>

logo must be an image.
logo must be a file with format: jpeg, bmp, png.