error executing child request for handler 'system.Web.HttpHandlerUtil+serverExecuteHttphandlerAsynWrapper

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ASP.NET

MVC

MVC3

MVC2

mylogin page is a partialview . and i use @html.Action("LogOn")

but it can't in my Logon action ,redirect to "mainIndex" . and says :

error executing child request for handler 'system.Web.HttpHandlerUtil+serverExecuteHttphandlerAsynWrapper

i changed @html.Action("LogOn") to @{html.RenderAction ("LogOn")} , but didn't diffrent . and changed to @{Html.partialView("LogOn")} but the error :

The model item passed into the dictionary is of type 'System.String', but this dictionary requires a model item of type 'MyProject.Models.UsersClass+LogOn'.

MY CODE:

[HttpGet]
       public ActionResult LogOn(String returnUrl)
        {

       using (var db = new pakalaContext())
       {
           UsersClass.LogOn AllFeatureToLog = new UsersClass.LogOn();

           if (User.Identity.IsAuthenticated) //remember me
           {
               MyClass obj = new MyClass();
               if (obj.shouldRedirect(returnUrl))
               {
                   return Redirect(returnUrl);
               }
               return Redirect(FormsAuthentication.DefaultUrl);
           }

           return PartialView(AllFeatureToLog);
       }
   }



   public MyProject.Models.AccountModels.ControlUsers MembershipService { get; set; }

   [HttpPost]
   public ActionResult LogOn(UsersClass.LogOn loginInfo, string returnUrl)
   {


       if (this.ModelState.IsValid)
       {

           if (MembershipService.ValidateUser(loginInfo.usernam, loginInfo.password))
               {
               FormsAuthentication.SetAuthCookie(loginInfo.usernam,   loginInfo.RememberMe);
               MyClass obj1 = new MyClass();
               if (obj1.shouldRedirect(returnUrl))
               {
                   return Redirect(returnUrl);
               }
               else
               {
                   return RedirectToAction("MainIndex", "Home");
               }
                               }

           else
           {
               this.ModelState.AddModelError("LoginError", "incorrec pass or username");

           }
       }



       return PartialView(loginInfo);
   }