The type or namespace IAppBuilder could not be found(missing using a directive pr an assembly reference)

c# asp.net-mvc-4 signalr owin
DoIt picture DoIt · Feb 12, 2014 · Viewed 59.7k times · Source

I am working on an Asp.Net MVC 4 Application in which I am using SignalR 2.0.1 and I Mapped it using Owin Startup class and it worked fine at first.

All of a sudden when I tried to rebuild my app it said that the type are namespace IAppbuilder could not be found.

Following is my start up class

using Microsoft.Owin;
using Owin;
using WhiteBoardApp;

namespace WhiteBoardApp
{
    public class Startup
    {
        public void Configuration(IAppBuilder app)
        {
            app.MapSignalR();
        }
    }
}

I have installed Owin package too, and for some reasons I could not find Owin Startup class so I just added a normal class and included all the references that are needed. May I know where I am making a mistake

Answer

scottt732 picture scottt732 · Feb 12, 2014

Try to use Package Manage Console and do 

Update-Package Owin -Reinstall

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