打包 Homestead box 报错:The Vagrant virtual environment you are trying to package must be powered off

请问一下如何package一个 Homestead-box，我敲了如下命令返如下:

➜  Homestead git:(master) vagrant halt
➜  Homestead git:(master) vagrant package --output h-0417.box
The Vagrant virtual environment you are trying to package must be powered off.
➜  Homestead git:(master) vagrant box list
coreos-alpha      (virtualbox, 509.1.0)
coreos-alpha      (virtualbox, 522.0.0)
laravel/homestead (virtualbox, 0.4.2)
➜  Homestead git:(master) vagrant package --output h-0417.box --base laravel/homestead.box
==> laravel/homestead.box: VM not created. Moving on...
➜  Homestead git:(master) pwd
/Users/qk/Homestead
➜  Homestead git:(master) vagrant --version
Vagrant 1.8.1

我参考的部分资料如下,没有出现我机器上的现象是不是我本机有啥额外的设置:

how-to-create-a-vagrant-base-box-from-an-existing-one

How-to-Create-a-CentOS-Vagrant-Base-Box