TdLib.TdException: "Call protocol must be non-empty"

[Primus-max]

I'm trying to make a call, here is the code

public async Task MakeCallAsync(long userId, bool isVideoCall)
{
    try
    {
        var callProtocol = new CallProtocol
        {
            UdpP2p = true,
            UdpReflector = true,
            LibraryVersions = new string[] { "1.0.0", "2.0.0" },
            MaxLayer = 105,
            MinLayer = 102
        };

        // Create a call
        var createCallResult = await _client.CreateCallAsync(userId, callProtocol, isVideoCall);

        if (createCallResult is TdApi.CallId callId)
        {
            // Call created successfully
            Console.WriteLine("Call created successfully.");

            // Accept the call
            try
            {
                var acceptCallResult = await _client.AcceptCallAsync(callId.Id);
                if (acceptCallResult is Ok)
                {
                    Console.WriteLine("Call accepted successfully.");

                    // Play audio/video

                    // Wait for a specified time
                    await Task.Delay(TimeSpan.FromSeconds(30));

                    // End the call
                    var discardCallResult = await _client.DiscardCallAsync(callId.Id);
                    if (discardCallResult is Ok)
                    {
                        Console.WriteLine("Call ended successfully.");
                    }
                }
            }
            catch (Exception)
            {

                throw;
            }
        }
    }
    catch (Exception ex)
    {
        Console.WriteLine($"Error making the call: {ex.Message}");
    }
}

But I am getting an error: TdLib.TdException: "Call protocol must be non-empty"
But sometimes, even with an error, a call occurs, but it is not possible not to accept or reject it.

[ForNeVeR]

It's hard to tell what's happening here as I myself have never used calls in tdlib. Have you tried also asking of the upstream developers about the issue? Maybe there's something obvious missing here?

[Primus-max]

So far I've only come here with this problem.