npm ERR! 404 Not Found - GET https://registry.npmjs.org/error-ex

As you can see on https://status.npmjs.org, 4 packages are down at this moment.

They've fixed the issue but we need to wait for CDN world propagation.

Don't update your packages or install new one to fix this.

EDIT: not working yet in Europe at 14:34 UTC

Try configuring npm using this npm config set registry https://skimdb.npmjs.com/registry