Mac安装Homestead出现的问题，昨天弄了一天了，望大神解救。

我在homestead目录下载了virtualbox.box，是0.5.0版本的，然后cd 进入目录，执行这个命令：vagrant box add laravel/homestead virtualbox.box
出现这个问题：
==> box: Box file was not detected as metadata. Adding it directly...
==> box: Adding box 'laravel/homestead' (v0) for provider:
box: Unpacking necessary files from: file:///Users/qing/homestead/virtualbox.box
An error occurred while downloading the remote file. The error
message, if any, is reproduced below. Please fix this error and try
again.

vitrtualbox是在这下载的https://atlas.hashicorp.com/laravel/boxes/homestead/versions/0.5.0/providers/virtualbox.box

尝试了网上的很多方法，好像都不行，求救，谢谢了。