Error in plugins : The view at ... must derive from WebViewPage, or WebViewPage<TModel>.

The view at '~/Plugins/Misc.Ebay4Two/Views/test.cshtml' must derive from WebViewPage, or WebViewPage<TModel>.

@using Nop.Web.Framework;
@using Nop.Web.Framework.UI;
@model Nop.Plugin.Misc.Ebay4Two.Domain.EbayCategory

@{
    Layout = "_AdminLayout.cshtml";
}

test test

public class CustomViewEngine : ThemeableRazorViewEngine
    {
        public CustomViewEngine()
        {
            ViewLocationFormats = new[] { "~/Plugins/Misc.Ebay4Two/Views/{0}.cshtml" };
            PartialViewLocationFormats = new[] { "~/Plugins/Misc.Ebay4Two/Views/{0}.cshtml" };
        }
    }

public class RouteConfig :IRouteProvider
    {
        public int Priority
        {
            get {return 1;}
        }
        public void RegisterRoutes(RouteCollection routes)
        {

            ViewEngines.Engines.Insert(0, new CustomViewEngine());
        }
    }