Background

I have an umbrella app and I am trying to add a phoenix app inside of it. However, When I run the mix command to create a phoenix umbrella app, I get an error I don’t understand.

Problem

I have an umbrella app with the following structure:

market_manager
  |_apps
    |_ app1
    |_ app2

I want to add another umbrella app to my apps folder, a phx_test_app.
To do so I am running mix phx.new.web phx_test --live --no-ecto inside of my apps folder. However I get the following error:

λ mix phx.new.web test --no-ecto
** (Mix) Could not find "use Mix.Config" or "import Config" in "c:/Users/palme/Documents/GitHub/market_manager/config/config.exs"

To me this is confusing, as this is contents of the file in question:

import Config

import_config "#{Mix.env()}.exs"

So I definitely have the one thing the error says I am missing.

Questions

Why am I having this error and how can I fix it?

For those of you curious enough, this is the project in question:
https://github.com/Fl4m3Ph03n1x/market_manager/tree/dev