Callback called more than once while running npm install

Question

I am having some trouble to deploy my Node.JS application to AWS using ElasticBeanStalk.

As soon as the deploy starts, while running the npm install script (default by AWS), I get the following weird error:

[email protected] node_modules/material-ui
  ├── [email protected]
  ├── [email protected]
  ├── [email protected]
  ├── [email protected]
  ├── [email protected] ([email protected])
  ├── [email protected] ([email protected], [email protected])
  ├── [email protected]
  ├── [email protected] ([email protected])
  └── [email protected] ([email protected], [email protected], [email protected], [email protected])
  npm ERR! Linux 4.1.17-22.30.amzn1.x86_64
  npm ERR! argv "/opt/elasticbeanstalk/node-install/node-v4.3.0-linux-x64/bin/node" "/opt/elasticbeanstalk/node-install/node-v4.3.0-linux-x64/bin/npm" "--production" "install"
  npm ERR! node v4.3.0
  npm ERR! npm  v2.14.12

  npm ERR! Callback called more than once.
  npm ERR!
  npm ERR! If you need help, you may report this error at:
  npm ERR!     <https://github.com/npm/npm/issues>

  npm ERR! Please include the following file with any support request:
  npm ERR!     /tmp/deployment/application/npm-debug.log

Can anyone help me debug this problem? I've already spent too many hours trying to understand what is happening, but got no results so far.

Thanks!

Answer 1

Updating npm solved it for me

npm i -g npm

Answer 2

Apparently some AWS regions do have connection problems with npm (as related in this issue) and I solved it by forcing npm to download modules via http instead of https.

To do that I added a .npmrc file to the root directory of my project with the following content:
registry=http://registry.npmjs.org/

Thanks @Jason Livesay for the tips and @danilojun for helping me find the best solution!