学习laravel所遇问题：Undefined variable: errors

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问题：Undefined variable: errors (View: C:\wamp\www\StuLaravel5\resources\views\login.blade.php)

login.blade.php代码：

@section('content')

    
        
            
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                                                              {!! csrf_field() !!}                         has('email') ? ' has-error' : '' }}">                             邮 箱                                                                                               @if ($errors->has('email'))                                                                              {{ $errors->first('email') }}                                                                      @endif                             

                        

                        has('password') ? ' has-error' : '' }}">                             密 码                                                                                               @if ($errors->has('password'))                                                                              {{ $errors->first('password') }}                                                                      @endif                             

                        

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