SignalR: Websocket closed with error: InternalServerError - asp.net-core

Question

On the front side when the user adds a new mp3. In addition to writing this to the database, I also need to transfer that mp3 to the client side. But my client side is Worker Service. I need to transfer this mp3 to that Worker Service via SignalR.
My SignalR server project codes :
Startup hub endpoint :
app.UseEndpoints(endpoints =>
{
endpoints.MapControllerRoute(
name: "default",
pattern: "{controller}/{action}/{id?}");
endpoints.MapHub<TrackHub>("/hubs/track");
});
Hub :
public class TrackHub : Hub
{
public static Dictionary<int, string> ActiveUsers = new Dictionary<int, string>();
public TrackHub()
{
}
public async Task SendMessage(string message)
{
var connectionId = Context.ConnectionId;
await Clients.Others.SendAsync("ReceiveMessage", message + connectionId);
}
public override async Task OnConnectedAsync()
{
await Clients.All.SendAsync("ActiveUsers");
}
public override async Task OnDisconnectedAsync(Exception exception)
{
await Clients.All.SendAsync("ActiveUsers");
}
}
HubContext
public class TrackBusiness
{
private readonly IHubContext<TrackHub> _hubContext;
public TrackBusiness(IHubContext<TrackHub> hubContext)
{
_hubContext = hubContext;
}
public Task SendMessage()
{
return _hubContext.Clients.All.SendAsync("Receive");
}
}
And my client side - worker service project :
public class SocketService : ISocketService
{
private HubConnection? _connection;
private readonly IConfiguration _configuration;
private readonly ILogger<SocketService> _logger;
public event OnNewTrackAddedEventHandler NewTrackAdded;
public event OnDeviceDeletedEventHandler DeviceDeleted;
public SocketService(IConfiguration configuration, ILogger<SocketService> logger)
{
_configuration = configuration;
_logger = logger;
}
public async Task Start()
{
_connection = new HubConnectionBuilder()
.WithUrl(_configuration.GetValue<string>("SocketUrl"))
.WithAutomaticReconnect(new[] { TimeSpan.Zero, TimeSpan.Zero, TimeSpan.FromSeconds(10) })
.Build();
_connection.Reconnected += connectionId =>
{
if (_connection.State == HubConnectionState.Connected)
{
_logger.LogInformation("Socket reconnected");
}
if (_connection.State == HubConnectionState.Reconnecting)
{
_logger.LogInformation("Socket try to reconnect");
}
return Task.CompletedTask;
};
_connection.On<string, byte[]>("SendMessage", (imei, track) =>
{
NewTrackAdded.Invoke(imei, track);
});
_connection.On<string>("DeviceDeleted", (imei) =>
{
DeviceDeleted.Invoke(imei);
});
try
{
await _connection.StartAsync();
_logger.LogInformation("Socket started");
}
catch (Exception e)
{
_logger.LogWarning("Socket can't connect : {0}", e.Message);
}
}
}
My appSettings :
{
"Logging": {
"LogLevel": {
"Default": "Information",
"Microsoft.Hosting.Lifetime": "Information"
}
},
"ApiUrl": "localhost",
"SocketUrl": "http://localhost:29082/hubs/track"
}
But I run into this error when I start the project. Can you help with the problem?