Error Handling 404 in MVC5 with AttributeRouting

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MVC

error-handling

Razor

Hi,
I´m creating a MVC5 app using Attribute Routing. After reading many Error Handling stuff, I create a CustomErrorHandlerAttribute, create an Application_Error method into global.asax and modify the web.config customErrors tag.
The routes are mapped as attributes aka [Route("Account")].... so the route mapping is defined as:

public static void RegisterRoutes(RouteCollection routes)
{
    routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

    routes.MapMvcAttributeRoutes();
}

I get only the 404.0 standar error page not my custom page. I put an interruption point at the begining of the CustomHandlerAttribute and Application_Error Methods and could not catch it.

Where the routing error is thrown in order to catch it?

Any Idea of what is happening?

Thanks in advance,
Toni