The server factory could not be located for the given input: Microsoft.Owin.Host.HttpListener

I have implemente signalR in window service.

private IDisposable SignalR { get; set; }

public void Configuration(IAppBuilder app)
{   
        var hubconfig=new Microsoft.AspNet.SignalR.HubConfiguration();
        hubconfig.EnableJSONP = true;
                    
        app.UseCors(CorsOptions.AllowAll);
        app.MapSignalR(hubconfig);
}


private void StartSignalRServer(StringBuilder sbLog)
{
        try
        {
            this.SignalR = WebApp.Start(ServerURI); //This throws exception

            //this.SignalR= WebApp.Start<Startup>(ServerURI);
            sbLog.Append(string.Format("{0}--------SignalR Server Started------",Environment.NewLine));
        }
        catch (Exception ex)
        {
            sbLog.Append(string.Format("{0}Exception in StartSignalRServer=>{1}", Environment.NewLine,ex.Message));
        }
}

> Exception:The server factory could not be located for the given input: > Microsoft.Owin.Host.HttpListener

The Microsoft.Owin.Host.HttpListener assembly is a runtime reference in WebApp.Start. You need to include it in the project's references for it to be available for loading. Check the bin\Debug (etc) directory to make sure it's included. May as well add it as a nuget dependency as well.

Install the package:

PM> Install-Package Microsoft.Owin.Host.HttpListener

Install the Microsoft.Owin.Host.HttpListener package from Nuget using:

PM> Install-Package Microsoft.Owin.Host.HttpListener

(unlike an earlier answer you should avoid using -IncludePrerelease in production code)

I encountered same error.

In project A -- I am starting owin web service using WebApp.Start() in a function. In Project B -- I am calling project A's function here. Unfortunately Project B is not my .Net solution's startup project. Project C is my .Net Solution startup project.

If I Install nuget package using command Install-Package Microsoft.Owin.Host.HttpListener in solution's start up project i.e Project, C it works fine. If I do the same in Project B it does not work. So be careful while installing nuget package.