问为什么我得到状态为500的错误(内部服务器错误)

EN

error: function (data) {
                        swal("Oops", "Something went wrong!", "error");
                    }

[HttpPost,ActionName("Delete")]
[ValidateAntiForgeryToken]
public ActionResult DeleteConfirmed(int id)
{
    Language language = db.Languages.Find(id);
    db.Languages.Remove(language);
    db.SaveChanges();
    return RedirectToAction(nameof(Index));
}

<div class="panel panel-flat">
    <div class="panel-body">
        <table class="table datatable-responsive datatable-languages">
            <thead>
                <tr class="bg-blue">
                    <th>
                        Language Name
                    </th>
                    <th>
                        Country Code (Flag)
                    </th>
                    <th></th>
                </tr>
            </thead>
            <tbody>
                @foreach (var item in Model)
                {
                    <tr id="tr-id-@item.language_id">

                        <td>
                            @Html.DisplayFor(modelItem => item.name)
                        </td>

                        <td>
                            @Html.DisplayFor(modelItem => item.code)
                        </td>


                        <td>
                            <ul class="icons-list text-left">
                                <li class="text-primary-600"><a href="~/Languages/Edit?Id=@item.language_id"><i class="icon-pencil7"></i></a></li>
                                <li class="text-danger-600"><a class="delete_languages" href="javascript:;" data-id="@item.language_id"><i class="icon-trash"></i></a></li>
                            </ul>
                        </td>
                    </tr>
                }
            </tbody>
        </table>
    </div>
</div>

<script>
    $('.datatable-languages').DataTable({
        dom: 'Bfrtip',
        columnDefs: [
            {
                responsivePriority: 1,
                targets: -1
            },
            {
                targets: [-1],
                orderable: false,
                searchable: false,
                printable: false,
                width: "120"
            }
        ]
    });

    $(document).on('click', '.delete_languages', function () {
        var myId = $(this).attr('data-id');
        console.log(myId);
        var parent = $(this).parent().parent().parent().parent();
        swal({
            title: "Are you sure?",
            type: "warning",
            showCancelButton: true,
            confirmButtonColor: "#FF7043",
            confirmButtonText: "Yes, delete it!",
            closeOnConfirm: false,
            showLoaderOnConfirm: true,
        },
            function () {
                $.ajax({
                    type: "post",
                    url: "/Languages/Delete",
                    data: { id: myId },
                    success: function () {
                        parent.fadeOut('slow', function () { $(this).remove(); $('.child').remove() });
                        setTimeout(function () { swal("Deleted!", "Record deleted successfully!", "success"); }, 2000);
                    },
                    error: function (data) {
                        swal("Oops", "Something went wrong!", "error");
                    }
                });

            })
    });
</script>

<td>
    @Html.ActionLink("Edit", "Edit", new { id = item.BlogId }) <br />
    @Html.ActionLink("Details", "Details", new { id = item.BlogId }) <br />
    @Html.ActionLink("Delete", "Delete", new { id = item.BlogId })
</td>