Redirect ActionResult

Good to all. I'm trying to redirect from one Actionresult to another and have tried everything ever without success. At this point I find the following code:

  [AllowAnonymous]
            public ActionResult Index_GA_ER(string tkn)
            {
                return RedirectToAction("Index", "Eresults_Base");
            }

        [ChildActionOnly]
        public ActionResult Menu()
        {           
            var menuOptions = Session.GetDataFromSession<List<Menu>>(StoreManagerKeys.Menus);
            string tkn = "";
            string a = "Eresults_MenuOption_";

                if (ConfigurationManager.AppSettings["generateInterfeatures"] != "true" || menuOptions != null)
                {
                    foreach (var button in menuOptions)
                    {
                        string b = RemoveDiacritics(button.Description).Replace(" ", "_");

                        button.MenuClass = a + b;
                    }

                    return PartialView(menuOptions);
                }
            return Index_GA_ER(tkn);
        }

For which I have the error

Child actions are not allowed to perform redirect actions.

Can anyone help?