ENOENT: no such file or directory, scandir '..../node_modules/node-sass/vendor'

$ time ember build
ENOENT: no such file or directory, scandir '/vagrant/webui/node_modules/node-sass/vendor'
Error: ENOENT: no such file or directory, scandir '/vagrant/webui/node_modules/node-sass/vendor'
    at Error (native)
    at Object.fs.readdirSync (fs.js:856:18)
    at Object.getInstalledBinaries (/vagrant/webui/node_modules/node-sass/lib/extensions.js:119:13)
    at foundBinariesList (/vagrant/webui/node_modules/node-sass/lib/errors.js:20:15)
    at foundBinaries (/vagrant/webui/node_modules/node-sass/lib/errors.js:15:5)
    at Object.module.exports.missingBinary (/vagrant/webui/node_modules/node-sass/lib/errors.js:45:5)
    at Object. (/vagrant/webui/node_modules/node-sass/lib/index.js:15:28)
    at Module._compile (module.js:413:34)
    at Object.Module._extensions..js (module.js:422:10)
    at Module.load (module.js:357:32)

$ ls node_modules/node-sass/
bin  binding.gyp  CHANGELOG.md  lib  LICENSE  node_modules  package.json  README.md  scripts  src  test

Issue was fixed by running 

npm rebuild node-sass

https://github.com/sass/node-sass/issues/1387#issuecomment-185451183 

$ npm rebuild node-sass

> node-sass@3.9.3 install /vagrant/webui/node_modules/node-sass
> node scripts/install.js

Start downloading binary at https://github.com/sass/node-sass/releases/download/v3.9.3/linux-x64-47_binding.node
Binary downloaded and installed at /vagrant/webui/node_modules/node-sass/vendor/linux-x64-47/binding.nodede:

> node-sass@3.9.3 postinstall /vagrant/webui/node_modules/node-sass
> node scripts/build.js

"/vagrant/webui/node_modules/node-sass/vendor/linux-x64-47/binding.node" exists.
 testing binary.
Binary is fine; exiting.
node-sass@3.9.3 /vagrant/webui/node_modules/node-sass