@if($errors->any())
        @foreach($errors->all() as $error)
            <div class="alert alert-danger fade in">
                <i class="fa-fw fa fa-times"></i>
                {{$error}}
            </div>
        @endforeach
    @endif

以上这段代码加在\resources\views\Admin\Login\index.blade.php

效果如下图：