Vagrant + Chef: Error in provision “Shared folders that Chef requires are missing on the virtual machine.”

it seems like there is a bug with sync folders, this clears the cache and fixed it for me. (from your project directory)

rm .vagrant/machines/default/virtualbox/synced_folders
vagrant reload --provision

https://github.com/mitchellh/vagrant/issues/5199

EDIT: this should be fixed in vagrant 1.7.4