重新导入 Homestead 出现问题，请问如何解决？

macdeMBP:lt-homestead-3-0-0-2017082400 mac$ vagrant box add metadata.json
==> box: Loading metadata for box 'metadata.json'
    box: URL: file:///Volumes/%E6%95%B0%E6%8D%AE%E7%9B%98/%E6%9C%AA%E5%91%BD%E5%90%8D%E6%96%87%E4%BB%B6%E5%A4%B9/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.

Name: laravel/homestead
Provider: virtualbox
Version: 3.0.0
macdeMBP:lt-homestead-3-0-0-2017082400 mac$