There are errors in the configuration of this machine. Please fix the following errors and try again:
vagrant-omnibus:
* '11.18.6' is not a valid version of Chef.
A list of valid versions can be found at: http://www.opscode.com/chef/install/
Attempting to set this version in the Vagrant file: config.omnibus.chef_version = '11.18.6'
Attempting to set this version in the Vagrant file:
config.omnibus.chef_version = '11.18.6'
This version has a fix for issue: https://github.com/chef/chef/issues/2786. Release of Chef 11.18.6: https://www.chef.io/blog/2015/01/29/chef-11-18-6-released.
The client can be downloaded via: https://opscode-omnibus-packages.s3.amazonaws.com/windows/2008r2/x86_64/chef-windows-11.18.6-1.windows.msi