MVC - Synchronous XMLHttpRequest on the main thread is deprecated - asp.net-mvc-4

Question

I am new in MVC and i was looking for by above error but a i can't find it.
I create a partial view to EDIT and CHANGE the data base. Partial View is callling from INDEX.cshtml.
When I call one specific item the program below is executed at the first time in this point:
I have one field (date) with drop down. I use the datepicker function. In debug mode at the same program below is executed again because to the datepicker function and IN THIS MOMENT i receive a warning message at the command Open as shown at the second screenshot below.
_Edit.cshtml
Im my partial view I have the code below (part) with the datepicker. Two points. Will be this the problem (two points to datepicker ?).
Does anyone can help me to solve this problem ?
Thanks in advance
#model i_Projeto.Models.Ativ_Compr_Models
#using Newtonsoft.Json
<link href="~/Content/bootstrap.css" rel="stylesheet" />
<link href="~/Content/bootstrap-datepicker.css" rel="stylesheet" />
.
.
.
.
.
#section Scripts {
#Scripts.Render("~/bundles/jqueryval")
}
<script src="~/Scripts/bootstrap-datepicker.js"></script>
<script src="~/Scripts/locales/bootstrap-datepicker.pt-BR.min.js"></script>
<script type="text/javascript">
$('#DeadLine').datepicker({
language: 'pt-BR',
autoclose: true,
orientation: "bottom right",
dateFormat: 'dd/mm/yyyy',
changeMonth: true,
changeYear: true,
selectOtherMonths: true
});

Answer 1

I solved the problem!
remove it in partial view:
<link href="~/Content/bootstrap.css" rel="stylesheet" />
<link href="~/Content/bootstrap-datepicker.css" rel="stylesheet" />
And put it in the View Father.
<link href="~/Content/bootstrap.css" rel="stylesheet" />
<link href="~/Content/bootstrap-datepicker.css" rel="stylesheet" />