mac系統安裝，執行vagrant時報錯如下：

/opt/vagrant/embedded/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require': cannot load such file -- vagrant-share/helper/api (LoadError)

from /opt/vagrant/embedded/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'

? ?~ git:(master) ? vagrant -v

Vagrant 1.9.4

? ?~ git:(master) ? VirtualBox --help

Oracle VM VirtualBox Manager 5.1.22

解決方法：

? ?~ git:(master) ? vagrant plugin install vagrant-share --plugin-version 1.1.8