Cannot find module 'node-sass-middleware'

When trying to use gulp, I'm having ' Cannot find module 'node-sass-middleware' ' error.

module.js:340
throw err;
      ^
Error: Cannot find module 'node-sass-middleware'
    at Function.Module._resolveFilename (module.js:338:15)
    at Function.Module._load (module.js:280:25)
    at Module.require (module.js:364:17)
    at require (module.js:380:17)
    at Object.<anonymous> (/home/wallet/node_modules/gulp-sass/node_modules/node-sass/sass.js:180:22)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Module.require (module.js:364:17)

node-sass-middleware is empty for some reason. I've installed gulp like

sudo npm install -g gulp

node-sass-middleware folder has appeared, but its empty inside but a node_modules folder which is also empty.

/home/wallet/node_modules/gulp-sass/node_modules/node-sass/node_modules/node-sass-middleware/.js

Am I installing gulp wrong?