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POSignalR: Internal Server Error when calling hub method
 

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    <p>I've been playing around with SignalR for a few days and I have to say that it's an absolutely phenomenal library. I've managed to get a few things working with it and was astounded at the simplicity, but I recently ran into a small problem.</p> <p>I'm unable to call a Hub method from JavaScript in the browser. The request returns a 500 error code, and when I look at the error page source, I see this:</p> <pre><code>[ArgumentNullException: Value cannot be null. Parameter name: s] System.IO.StringReader..ctor(String s) +10207225 Newtonsoft.Json.Linq.JObject.Parse(String json) +74 SignalR.Hubs.HubRequestParser.Parse(String data) +78 SignalR.Hubs.HubDispatcher.OnReceivedAsync(IRequest request, String connectionId, String data) +266 SignalR.&lt;&gt;c__DisplayClass6.&lt;ProcessRequestAsync&gt;b__4(String data) +84 SignalR.Transports.ForeverTransport.ProcessSendRequest() +159 SignalR.Transports.ForeverTransport.ProcessRequestCore(ITransportConnection connection) +149 SignalR.Transports.ForeverTransport.ProcessRequest(ITransportConnection connection) +42 SignalR.PersistentConnection.ProcessRequestAsync(HostContext context) +1087 SignalR.Hubs.HubDispatcher.ProcessRequestAsync(HostContext context) +251 SignalR.Hosting.AspNet.AspNetHandler.ProcessRequestAsync(HttpContextBase context) +656 SignalR.Hosting.AspNet.HttpTaskAsyncHandler.System.Web.IHttpAsyncHandler.BeginProcessReques t(HttpContext context, AsyncCallback cb, Object extraData) +143 System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +9479007 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&amp; completedSynchronously) +178 </code></pre> <p>My server-side code is:</p> <pre><code>public class SourceHub : Hub { public void RegisterSource(string source) { Groups.Add(Context.ConnectionId, source); } } </code></pre> <p>and on the client-side I have:</p> <pre><code>var SourceHub = $.connection.sourceHub; $.connection.hub.start().done(function () { SourceHub.registerSource("test"); }); </code></pre> <p>I've been digging for a while, but I just can't find the source of the problem... could someone please help me out?</p>
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