Specified argument was out of the range of valid values (Parameter name: site)
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Problem with your Action signature. Since, the Index is a default action defined in RegisterRoutes so it would be invoked as soon as you launch the site. Since MVC excepts the return type of ActionResult and throws exception if does not find in invoked action. You can change the return type to ActionResult and wrap the return value in Json if the value return is excepted of type string.
public ActionResult Index()
{
return this.Json(typeof(Controller).Assembly.GetName().Version.ToString());
}
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