I want to use the library GitHub - qzhuyan/quicer which is written in Erlang.
The readme contains a sample snippet:

application:ensure_all_started(quicer),
Port = 4567,
LOptions = [ {certfile, "cert.pem"}
           , {keyfile,  "key.pem"}
           , {alpn, ["sample"]}
           , {peer_bidi_stream_count, 1}
             ],
{ok, L} = quicer:listen(Port, LOptions),
{ok, Conn} = quicer:accept(L, [], 120000),
{ok, Conn} = quicer:handshake(Conn),
{ok, Stm} = quicer:accept_stream(Conn, []),
receive {quic, <<"ping">>, Stm, _Props} -> ok end,
{ok, 4} = quicer:send(Stm, <<"pong">>),
quicer:close_listener(L).

which I translated to the following:

:application.ensure_all_started(:quicer)

    port = 4567
    l_options = [
      {:certfile, "cert.pem"},
      {:keyfile, "key.pem"},
      {:alpn, ["sample"]},
      {:peer_bidi_stream_count, 1}
    ]
    # {:error, :badarg}
    {:ok, listener} = :quicer.listen(port, l_options)
    {:ok, conn} = :quicer.accept(listener, [], 120_000)
    {:ok, conn} = :quicer.handshake(conn)
    {:ok, stm} = :quicer.accept_stream(conn, [])

    receive do
      {:quic, <<"ping">>, stm, _props} -> :ok
    end

    {:ok, 4} = :quicer.send(stm, <<"pong">>)
    :quicer.close_listener(listener)

Something seems to be wrong, as there is a badarg (marked above).
ElixirLS Dialyzer is reporting the following:

The call quicer:listen
         (_port@1 :: 4567,
          _l_options@1 ::
              [{'alpn', [<<_:48>>, ...]} |
               {'certfile', <<_:64>>} |
               {'keyfile', <<_:56>>} |
               {'peer_bidi_stream_count', 1},
               ...]) breaks the contract 
          (listen_on(), listen_opts()) ->
             {'ok', listener_handler()} |
             {'error', 'listener_open_error', atom_reason()} |
             {'error', 'listener_start_error', atom_reason()}

What am I missing?
PS: ChatGPT came to the same translation