The error message below was linking to .../npm-windows-upgrade#usage.
A common reason is an attempted "npm install npm" or "npm upgrade npm". As of today, the only solution is to completely uninstall and then reinstall Node.js. For a small tutorial, please see https://github.com/felixrieseberg/npm-windows-upgrade#usage.
I updated it to refer to .../npm-windows-upgrade#fix-an-attempted-upgrade, which is the section that details how to fix the error.
The error message below was linking to .../npm-windows-upgrade#usage.
I updated it to refer to .../npm-windows-upgrade#fix-an-attempted-upgrade, which is the section that details how to fix the error.