unknown error running 'npm install --dev'

[derrelldurrett]

I've reported the details in an issue reported to npm (because that's what the error message told me to do). The upshot of the response was that you're depending on a no-longer-available version of mongoose (or something in your dependencies is), and that's never going to work.

In the response, @othiym23 suggested trying npm install, but that wasn't any better.