Laravel试图在根文件夹中存储缓存文件

在渲染任何页面时，我从Laravel5获得以下错误:

ErrorException in Filesystem.php line 74: 
file_put_contents(/fdcc73e2e72031a510ae8f921ce1d22d): failed to open stream: Permission denied

我的缓存配置如下:

<?php
return [
    /*
    |--------------------------------------------------------------------------
    | Default Cache Store
    |--------------------------------------------------------------------------
    |
    | This option controls the default cache connection that gets used while
    | using this caching library. This connection is used when another is
    | not explicitly specified when executing a given caching function.
    |
    */
    'default' => env('CACHE_DRIVER', 'file'),
    /*
    |--------------------------------------------------------------------------
    | Cache Stores
    |--------------------------------------------------------------------------
    |
    | Here you may define all of the cache "stores" for your application as
    | well as their drivers. You may even define multiple stores for the
    | same cache driver to group types of items stored in your caches.
    |
    */
    'stores' => [
        'apc' => [
            'driver' => 'apc'
        ],
        'array' => [
            'driver' => 'array'
        ],
        'database' => [
            'driver' => 'database',
            'table'  => 'cache',
            'connection' => null,
        ],
        'file' => [
            'driver' => 'file',
            'path'   => storage_path().'/framework/cache',
        ],
        'memcached' => [
            'driver'  => 'memcached',
            'servers' => [
                [
                    'host' => '127.0.0.1', 'port' => 11211, 'weight' => 100
                ],
            ],
        ],
        'redis' => [
            'driver' => 'redis',
            'connection' => 'default',
        ],
    ],
    /*
    |--------------------------------------------------------------------------
    | Cache Key Prefix
    |--------------------------------------------------------------------------
    |
    | When utilizing a RAM based store such as APC or Memcached, there might
    | be other applications utilizing the same cache. So, we'll specify a
    | value to get prefixed to all our keys so we can avoid collisions.
    |
    */
    'prefix' => 'laravel',
];

有趣的是，如果我将默认值更改为array或任何其他选项，它仍然尝试将缓存文件写入根文件夹并且每次都失败。

还有其他人遇到过这个问题吗?