When I try to call my SignalR hub’s Chat method I get the error – Error: Failed to invoke 'Chat' due to an error on the server. InvalidDataException: Error binding arguments. Make sure that the types of the provided values match the types of the hub method being invoked. If I remove the .withHubProtocol(new signalR.protocols.msgpack.MessagePackHubProtocol()) in the javascript call it works fine.