VerifyCsrfToken.php第53行中的TokenMismatchException：laravel 5.1中的(Firefox浏览器)？

我试图弄清楚为什么这个错误,即使它是全新安装.我在我的项目中也遇到了这个错误,所以我用谷歌搜索,没有答案对我有用.所以我创建了一个新项目,并复制了所有控制器,视图和模型.几个小时后再次正常工作,令牌不匹配错误.为什么在laravel中会发生这种情况？

我的表格

<form class="form-horizontal action="http://localhost/laravel/public/add-post-new"  enctype="multipart/form-data" method="POST" accept-charset="UTF-8" >
        <div class="form-group">
            <label for="inputEmail" class="control-label col-xs-2">Title</label>
            <div class="col-xs-10">
                <input type="text" class="form-control" id="post_title" placeholder="Title" name="post_title">
            </div>
        </div>

        <div class="form-group">
            <label for="inputPassword" class="control-label col-xs-2">Content</label>
            <div class="col-xs-10"><textarea class="form-control" style="resize:none" rows="25" name="post_content"></textarea>
            </div>
        </div>
         <div class="form-group">
            <label for="inputPassword" class="control-label col-xs-2">Featured Image</label>
            <div class="col-xs-10"><input type="file" class="filestyle" data-buttonText="Find" name="featured_image">
            </div>
        </div>
     <div class="form-group">
            <label for="inputPassword" class="control-label col-xs-2">Post Images</label>
            <div class="col-xs-10"><input type="file" class="filestyle"  name="post_gallery[]" multiple />
            </div>
        </div>  

     <div class="form-group">
            <label for="inputPassword" class="control-label col-xs-2">Select Category</label>
            <div class="col-xs-10" >
            <select  class="form-control" name="cat_id">
                <?PHP $data=Category::all(); ?>
            <option value="0">Default Category</option>
            @foreach($data as $value)
                 <option value="{{$value->id}}">{{$value->cat_name}}</option>
              @endforeach 
        </select>

            </div>
        </div>      
 <div class="form-group">
            <label for="inputPassword" class="control-label col-xs-2">Publish Post</label>
            <div class="col-xs-10">
           <label class="radio-inline">
  <input type="radio" name="published" id="inlineRadio1" value="1"> Publish 
</label><br>
<label class="radio-inline">
  <input type="radio" name="published" id="inlineRadio2" value="2"> UnPublish
</label><br>
<label class="radio-inline">
  <input type="radio" name="published" id="inlineRadio2" value="3"> Draft
</label><br><br>

            </div>
        </div>      
 <div class="form-group">
            <label for="inputPassword" class="control-label col-xs-2">Slider Post</label>
            <div class="col-xs-10">
           <label class="radio-inline">
  <input type="radio" name="slider_post" id="inlineRadio1" value="1"> Slider Post 
</label><br>
<label class="radio-inline">
  <input type="radio" name="slider_post" id="inlineRadio2" value="2"> Not required
</label><br><br>


            </div>
        </div>  
        <div class="form-group">
            <div class="col-xs-offset-2 col-xs-10">
                <input name="_token" type="hidden" value="{{ csrf_token() }}"/>

                <button type="submit" class="btn btn-primary">Submit Post</button>
            </div>
        </div>

在问问题之前,我已经阅读了很多教程

Laravel 5, Forms, TokenMismatchException in VerifyCsrfToken.php line 46

Laravel 5 Auth Post Submit – TokenMismatchException in VerifyCsrfToken.php line 46

TokenMismatchException in VerifyCsrfToken.php line 53 in Laravel 5.1

TokenMismatchException in VerifyCsrfToken.php line 46

Laravel 5, ajax, 500 Internal Server Error, TokenMismatchException in VerifyCsrfToken.php line 46:

Laravel 5 TokenMismatchException in VerifyCsrfToken.php line 46

Encountering “TokenMismatchException in VerifyCsrfToken.php” error

Laravel TokenMismatchException

http://laravel.io/forum/01-30-2015-laravel5-tokenmismatchexception-in-verifycsrftoken

TokenMismatchException when uploading a Video?

更新：

解决方法:

这可能会帮助某人.
检查您的以空行或空格开头的PHP文件！
这花了我很多麻烦.包括上面！