unity 2018.2.6f1
Assets/lib/Microsoft.AspNet.SignalR.Client/Transports/WebSockets/WebSocketWrapperRequest.cs(122,29): error CS1061: Type Microsoft.AspNet.SignalR.Client.IConnection' does not contain a definition forCertificates' and no extension method Certificates' of typeMicrosoft.AspNet.SignalR.Client.IConnection' could be found. Are you missing an assembly reference?