Question: One of the reasons that I moved from emacs to vim was to avoid awkward keybindings such as Ctrl+N and Ctrl+P for up and down. I would prefer more ergonomic keys like hjkl. However, I didn't find a way to navigate in Omnicomplete box without using arrow keys or Ctrl+N/P.

Does vim provide other keys for up and down?

![enter image description here](https://i.stack.imgur.com/nwyyr.png)

Answer: 
should enter your code directory and use "npm install" in your shell!
check the file permissions also please. Also may be your user login do not have the permission to make changes in the system. You may have to use sudo before the command to do so if you are on ubuntu or not a root user.