metadata.json 导入有问题？

➜ lt-homestead-3-0-0-2017082400 git:(master) ✗ ll
total 2565992
-rw-r--r--@ 1 yumiwei staff 1.2G 8 24 2017 homestead-virtualbox-3.0.0.box
-rw-r--r--@ 1 yumiwei staff 292B 8 24 2017 metadata.json

➜ lt-homestead-3-0-0-2017082400 git:(master) ✗ vagrant box add metadata.json
Homestead settings file not found in /Users/yumiwei/Homestead
Homestead settings file not found in /Users/yumiwei/Homestead
为什么我这边会没有配置文件，上面ll显示已经有了呀