Value cannot be null. (Parameter 'factory')

[panicou]

I created a simple program and got Value cannot be null. (Parameter 'factory') from Microsoft.Extensions.Logging.Abstractions

code as follows :

using System; using System.Reactive.Linq; using System.Threading.Tasks; using NEventSocket; using NEventSocket.FreeSwitch;

namespace ConsoleApp1 { class Program { static async Task Main(string[] args) { await CallTracking();

        Console.WriteLine("Hello World!");
    }

    public static async Task CallTracking()
    {
        using (var socket = await InboundSocket.Connect("XXX.XXX.XXX.XXX", 8021, "ClueCon"))
        {
            var apiResponse = await socket.SendApi("status");
            Console.WriteLine(apiResponse.BodyText);

            //Tell FreeSwitch which events we are interested in
            await socket.SubscribeEvents(EventName.ChannelAnswer);

            //Handle events as they come in using Rx
            socket.ChannelEvents.Where(x => x.EventName == EventName.ChannelAnswer)
                  .Subscribe(async x =>
                  {
                      Console.WriteLine("Channel Answer Event " + x.UUID);

                      //we have a channel id, now we can control it
                      await socket.Play(x.UUID, "misc/8000/misc-freeswitch_is_state_of_the_art.wav");
                  });
        }
    }
}

}

any ideas ??

i am using .net core 3.1

[lilunxm12]

Add NEventSocket.Logging.Logger.Configure(new LoggerFactory()); before your initialize any NEventSocket class

[panicou]

thx that solved it.

[samuelting]

This error message reminds you of specifying loggers used by NEventSocket Library. If you want to log NEventSocket with your logger, you may need to consider adding this in ConfigureServices method in the StartUp.cs in your .NET core application.

NEventSocket.Logging.Logger.Configure(LoggerFactory.Create(builder => {
                builder
                .AddConsole();
            }));