Application isn't started

[joaoevangelista]

You will also need to start a Supervisor on the start/2 callback instead of directly starting your Agent server, as per documentation:

The start/2 callback has to spawn and link a supervisor and return {:ok, pid} or {:ok, pid, state} , where pid is the PID of the supervisor, and state is an optional application state. args is the second element of the tuple given to the :mod option.

eg:

defmodule Dictionary.Runtime.Application do

  use Application

  def start(_type, _args) do
    children = [{Dictionary.Runtime.Server, []}]
    Supervisor.start_link(children, strategy: :one_for_one)
  end
end

And I think you will need to provide a start_link/1

@romenigld

don’t need an initial value on the Server.start_link

or you could implement your own child_spec instead of relying on the convention of {mod, args} tuple as presented on the variable children