You probably came here because your code is calling your component as a plain function call. This is now deprecated:
var MyComponent = require('MyComponent');
function render() {
return MyComponent({ foo: 'bar' }); // WARNING
==> default: Exporting NFS shared folders...
NFS is reporting that your exports file is invalid. Vagrant does
this check before making any changes to the file. Please correct
the issues below and execute "vagrant reload":
exports:2: path contains non-directory or non-existent components: /Users/<username>/path/to/vagrant
exports:2: no usable directories in export entry
exports:2: using fallback (marked offline): /