ASP.NET 4.5 - FAQs on SignalR Script Exceptions

March 5, 2013 · 2 min read

ASP.NET SignalR is pretty new and very exciting feature in ASP.NET. You might want to play around with it and may encounter some hiccups during your implementation. This post  will cover some issues that you may encounter and how to avoid it.

If you have declared the following scripts in your View(.cshtml/.aspx)

}

And finally, make sure that you have defined this line below in your Global.asax.cs within Application_Start event to avoid exception 3:

RouteTable.Routes.MapHubs;

Note: make sure that MapHubs is called before RegisterRoutes in your Application_Start event.

Exception 3: 0x800a138f - JavaScript runtime error: Unable to get property 'client' of undefined or null reference0x800a138f - JavaScript runtime error: Unable to get property 'client' of undefined or null reference

That's it! I hope someone find this post useful.

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This article is part of the GWB Archives. Original Author: Vincent Maverick Durano

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