'gulp' is not recognized as an internal or external command

Question

I am trying to use Gulp and Node.Js to stream my process for minifying and concatenating CSS/JS files for production.

Here is what I have done.

1. I installed

Answer 1

In my case, this problem occured because I did npm install with another system user in my project folder before. Gulp was already installed globally. After deleting folder /node_modules/ in my project, and running npm install with the current user, it worked.