** (ArgumentError) unknown registry: Req.Finch on a simple http request using Req library

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9

What does your “main file” look like?

Others will correct me if I’m wrong, but I think, based on @wojtekmach’s answer, it’s because your function calls are not themselves in a function, so they call functions at compile time instead of run time:

Try putting those function calls in a function:

defmodule Main do
  def go do
    Hello.say_hi()
    GetPayloadInfo.doReq()
  end
end

Then (without the Application.ensure_all_started), run the Main.go function in iex (in the directory containing your Mix project):

$ iex -S mix
iex> Main.go
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