刀片中无法访问请求错误(Laravel 5.2）

我使用laravel已经好几个月了，但从未遇到过这样的问题。

我制作了一个简单的Request类来验证更新用户请求，如果遵循验证规则，它就可以正常工作。如果验证规则失败，我们应该返回到上一页，并在html中显示所有错误。

据我说，我已经像以前在其他应用程序中一样正确地编写了所有内容，但$errors在刀片中似乎无法访问

以下是我需要调试的代码片段：

routes.php

Route::group(['middleware' => ['web']], function () {
    Route::get('/users/{id}/edit', 'UserController@edit');
    Route::post('/users/{id}/edit', 'UserController@update');
});

UserController.php

<?php
namespace App'Http'Controllers;
use Illuminate'Http'Request;
use App'Http'Requests;
use App'Http'Requests'UserUpdateRequest;
use App'Models'User;
use App'Models'Role;
use App'Models'Post;
class UserController extends Controller
{    
    public function edit($id)
    {
        try {
            $user = User::find($id);
            $roles = Role::all();
            return view('users.edit', compact(['user', 'roles']));
        }catch(Exception $e) {
            return view('errors.500', compact(['e']));
        }
    }
    public function update($id, UserUpdateRequest $request)
    {
        dd($request);
    }
}

UserUpdateRequest.php

<?php
namespace App'Http'Requests;
use App'Http'Requests'Request;
class UserUpdateRequest extends Request
{
    /**
     * Determine if the user is authorized to make this request.
     *
     * @return bool
     */
    public function authorize()
    {
        return true;
    }
    /**
     * Get the validation rules that apply to the request.
     *
     * @return array
     */
    public function rules()
    {
        return [
            'name'      =>  'required|string|min:4',
            'email'     =>  'required|email',
            'role'      =>  'required|numeric',
            'password'  =>  'required',
        ];
    }
}

edit.blade.php

@extends('master')
@section('title') Edit Users @stop
@section('content')
<div class="row">
    <div class="col-sm-12">
        <h2>Edit User</h2>
    </div>
</div>
<div class="alert alert-warning alert-dismissible" role="alert">
  @foreach($errors->all() as $error)
  {{ $error }}
  @endforeach
</div>
<form action="{{ url('/users/'.$user->id.'/edit') }}" method="post">
    <input type="hidden" name="_token" value="{{ csrf_token() }}">
    <div class="col-sm-6">
        <div class="form-group">
            <label>Name</label>
            <input type="text" name="name" value="{{ $user->name }}" class="form-control" placeholder="Name">
        </div>
    </div>
    <div class="col-sm-6">
        <div class="form-group">
            <label>Email Address</label>
            <input type="text" name="email" value="{{ $user->email }}" class="form-control" placeholder="Email Address">
        </div>
    </div>
    <div class="col-sm-6">
        <div class="form-group">
            <label>Role</label>
            <select name="role" class="form-control">
            @foreach($roles as $role)
            @if($role->id == $user->role)
            <option value="{{ $role->id }}" selected>{{ $role->name }}</option>
            @else
            <option value="{{ $role->id }}">{{ $role->name }}</option>
            @endif
            @endforeach
            </select>
        </div>
    </div>
    <div class="col-sm-6">
        <div class="form-group">
            <label>Password</label>
            <input type="password" name="password" class="form-control" placeholder="New Password">
        </div>
    </div>
    <div class="col-sm-12">
        <div class="form-group">
            <input type="submit" class="btn btn-info btn-block" value="Update">
        </div>
    </div>
</form>
@stop

浏览器上的HTML响应为空。我还尝试了<?php dd($errors); ?>，它显示了以下

Edit User
ViewErrorBag {#168 ▼
  #bags: []
}

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