I have an app with the following structure:

mix.exs
lib
  |_my_app.ex
  |_mix/tasks/my_mix_task.ex

The file lib/my_app.ex defines a module MyApp with a function load. The mix/tasks/my_mix_task.ex includes

defmodule Mix.Tasks.MyApp.MyTask do 
  use Mix.Task
 
 def run(_) do 
   Mix.Task.run("app.start")
    # IO stuff
   MyApp.load()
 end
end

When I run mix my_app.my_task the call to MyApp.load() gives

UndefinedFunctionError … (module MyApp is not available)

unless I run it from the root directory of my_app, in which case I get

(UndefinedFunctionError) function Hex.Mix.overridden_deps/1 is undefined (module Hex.Mix is not available)

I’ve run mix archive.build and mix archive.install to make it available globally.

Any ideas?