I\'m following this tutorial step by step
http://www.asp.net/signalr/overview/signalr-20/getting-started-with-signalr-20/tutorial-signalr-20-self-host
And I\
In my case, I had two projects:
MyProj.MvcWeb (an MVC application that referenced Microsoft.Owin.Security 3.0.0)MyProj.Data.Entities (a class library that referenced Microsoft.Owin.Security 2.1.0; not sure how this happened)Upgrading Microsoft.Owin.Security from 2.1.0 to 3.0.0 in the MyProj.Data.Entities project fixed the issue for me.