Failed to resolve include text for file: Directory\Manager.ttinclude

Loading the include file 'Manager.ttinclude' returned a null or empty string. The transformation will not be run.   BSCSecurityAddressBookWeb 

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filterContext.Result = new RedirectToRouteResult(
   new RouteValueDictionary{
   { "controller", "Account" },
   { "action", "SignIn" }
});

public ActionResult Index()
        {
            StudentsCodes model = new StudentsCodes();
            model.Student = (Student)CurrentUser;
            var user = UserManager.FindById(((Student)CurrentUser).InstructorID);
            model.Instructor =(Instructor) user;
            return View(model);
        }
public PartialViewResult DevelopmentPartial (StudentsCodes path )
        {
            return PartialView(path);
        }

<script type="text/javascript" src="~/Scripts/jquery.unobtrusive-ajax.js"></script>
    <script type="text/javascript" src="~/Scripts/jquery-3.1.1.js"></script>
	
	<ul id="tree">
        @foreach (var file in Directory.GetFiles(Server.MapPath("~/Content/" + Model.Student.UserName + "/CompilerProject/" + name)))
            {
                var filename = Path.GetFileName(file);
                <li id="filelist" onclick="@(Model.path = "~/Content/" + Model.Student.UserName + "/CompilerProject/src/" + @filename)">
                    
                    @filename
                /li>
                }
    
    <div id="partial">
        @{
            Html.RenderPartial("DevelopmentPartial",null);
        }

    </div>
	<script>
        $(document).ready(function () {
            $("#filelist").click(function (e) {
               @{Html.RenderAction("DevelopmentPartial", Model);
               }
            });
        });
    </script>

@using (Html.BeginForm())
        {
            var fileContents= "";
            if (Model==null)
            {
                fileContents = "";
            }
            else
            {
                fileContents = System.IO.File.ReadAllText(Server.MapPath(Model.path));
            }
                @Html.TextArea("code", fileContents, new { id = "code" })
        }

Html.RenderPartial( "~/Counter/counter.ascx", new ViewDataDictionary { { "digits", 6 }, { "id", "RLSBC" } } );