导入 metadata.json 时 Windows cmd 提示框架已存在？

之前删过一次vagrant，再次安装后运行vagrant box add metadata.json，Windows cmd提示：
==> box: Loading metadata for box 'metadata.json'
box: URL: file://F:/Sbulime%20Text/lt-homestead-3-0-0-2017082400/metadata.json
==> box: Adding box 'laravel/homestead' (v3.0.0) for provider: virtualbox
The box you're attempting to add already exists. Remove it before
adding it again or add it with the --force flag.
vagrant删除后是否需要删除注册表？
Homestread管理脚本如何删除？直接删除文件夹即可吗？