The problem is the applications key - if it’s not supplied at all, you get the built-in behavior where all of the applications listed in deps are started automatically.
If you supply a value, the runtime assumes you know what you are doing and ONLY starts those applications - so things like ranch which aren’t listed don’t get started, and you get the error you’re seeing.
A good writeup about the difference between applications and extra_applications from a while back.
