Node.js cannot find module 'readable-stream'

Question

I am new to node.js and stuck on the following. Any help will be appreciated:

I am running node.js (0.10.28) on ubuntu (12.10). The code I am working on is:

Answer 1

I was having this problem building a vue library. Deleting node_modules and re-running npm isntall and then rebuilding my lib worked.