defmodule The_App.Application do
  require Logger
  use Application

  def start(_type, _args) do
    :logger.add_handlers(:The_App)

    Print.text("Initiating The_App \n")

    children = [
      The_AppDB.Repo
    ]

    opts = [strategy: :one_for_one, name: The_App.Supervisor]
    Supervisor.start_link(children, opts)
  end
end

defmodule Supervisor.PyOperatorManager do
  use Supervisor

  def start_link(_) do
    Supervisor.start_link(__MODULE__, [], name: __MODULE__)
  end

  @impl true
  def init(_) do
    children = [
      :poolboy.child_spec(:py_pool,
        name: {:local, :py_pool},
        worker_module: Server.PyOperator,
        size: 4,
        max_overflow: 2
      )
    ]

    Supervisor.init(children, strategy: :one_for_one)
  end
  
  def launch() do
    :poolboy.transaction(:py_pool, fn pid ->
      GenServer.call(pid, {"hello_world", "main", "Hello"})
    end)
  end
end

defmodule Server.PyOperator do
  use GenServer
  use Export.Python

  def start_link(_) do
    GenServer.start_link(__MODULE__, %{}, name: __MODULE__)
  end

  def init(state) do
    Process.flag(:trap_exit, true)
    priv_path = Path.join(:code.priv_dir(:the_app), "python")
    {:ok, py} = Python.start_link(python_path: priv_path)
    {:ok, Map.put(state, :py, py)}
  end

  def handle_call({py_module, py_lambda, data}, _from, %{py: py} = state) do
    result = Python.call(py, py_module, py_lambda, [data])
    {:reply, result, state}
  end

  def terminate(_reason, %{py: py}) do
    Python.stop(py)
    :ok
  end
end

Interactive Elixir (1.12.2) - press Ctrl+C to exit (type h() ENTER for help)
iex(1)> Supervisor.PyOperatorManager.launch()
** (exit) exited in: :gen_server.call(:py_pool, {:checkout, #Reference<0.4022030713.2998403074.45553>, true}, 5000)
    ** (EXIT) no process: the process is not alive or there's no process currently associated with the given name, possibly because its application isn't started
    (stdlib 3.15.1) gen_server.erl:247: :gen_server.call/3
    (poolboy 1.5.2) /home/source/Desktop/The_App/deps/poolboy/src/poolboy.erl:63: :poolboy.checkout/3
    (poolboy 1.5.2) /home/source/Desktop/The_App/deps/poolboy/src/poolboy.erl:82: :poolboy.transaction/3
iex(1)> Supervisor.PyOperatorManager.start_link([])
** (EXIT from #PID<0.367.0>) shell process exited with reason: shutdown: failed to start child: :py_pool
    ** (EXIT) an exception was raised:
        ** (MatchError) no match of right hand side value: {:error, {:already_started, #PID<0.379.0>}}
            (poolboy 1.5.2) /home/source/Desktop/The_App/deps/poolboy/src/poolboy.erl:283: :poolboy.new_worker/1
            (poolboy 1.5.2) /home/source/Desktop/The_App/deps/poolboy/src/poolboy.erl:304: :poolboy.prepopulate/3
            (poolboy 1.5.2) /home/source/Desktop/The_App/deps/poolboy/src/poolboy.erl:153: :poolboy.init/3
            (stdlib 3.15.1) gen_server.erl:423: :gen_server.init_it/2
            (stdlib 3.15.1) gen_server.erl:390: :gen_server.init_it/6
            (stdlib 3.15.1) proc_lib.erl:226: :proc_lib.init_p_do_apply/3

What exactly is causing these errors and how are they properly addressed?