应用程序部署到活动服务器时出现内部服务器错误

我的ASP。Net web应用程序有一个简单的ajax文件上传到其中一个页面，在测试时在我的本地主机上运行良好，但是当我将其发布到网站时，我得到了500个内部服务器错误。下面是在Google chrome上控制台的输出:

POST http://switchclothing.andrewmwest.co.uk/StoreManager/UploadFiles 500 (Internal Server Error) jquery-2.1.0.min.js:4
l.cors.a.crossDomain.send jquery-2.1.0.min.js:4
o.extend.ajax jquery-2.1.0.min.js:4
send jquery.fileupload.js:834
$.widget._onSend jquery.fileupload.js:896
(anonymous function) jquery-ui-1.10.4.js:401
data.submit jquery.fileupload.js:612
(anonymous function) jquery.fileupload.js:180
j jquery-2.1.0.min.js:2
k.add jquery-2.1.0.min.js:2
$.widget.options.add jquery.fileupload.js:179
$.Widget._trigger jquery-ui-1.10.4.js:785
(anonymous function) jquery.fileupload.js:935
o.extend.each jquery-2.1.0.min.js:2
$.widget._onAdd jquery.fileupload.js:928
(anonymous function) jquery-ui-1.10.4.js:401
(anonymous function) jquery.fileupload.js:1105
j jquery-2.1.0.min.js:2
k.add jquery-2.1.0.min.js:2
d.always jquery-2.1.0.min.js:2
$.widget._onChange jquery.fileupload.js:1099
(anonymous function) jquery-ui-1.10.4.js:401
handlerProxy jquery-ui-1.10.4.js:702
o.event.dispatch jquery-2.1.0.min.js:3
r.handle jquery-2.1.0.min.js:3

点击请求的url，我在浏览器页面中得到这个错误:

The resource cannot be found.
Description: HTTP 404. The resource you are looking for (or one of its dependencies) could have been removed, had its name changed, or is temporarily unavailable.  Please review the following URL and make sure that it is spelled correctly. 
Requested URL: /StoreManager/UploadFiles

我还在下面附上了我的代码:

[HttpPost]
        public JsonResult UploadFiles()
        {
            var r = new List<UploadFilesResult>();
            foreach (string file in Request.Files)
            {
                HttpPostedFileBase hpf = Request.Files[file] as HttpPostedFileBase;
                if (hpf.ContentLength == 0)
                    continue;
                string savedFileName = Url.Content(Path.Combine(Server.MapPath("~/Images"), Path.GetFileName(hpf.FileName)));
                var path = GetNewPathForDupes(savedFileName);
                hpf.SaveAs(path);
                r.Add(new UploadFilesResult()
                {
                    Name = "/Images/" + Path.GetFileName(path),
                    Length = hpf.ContentLength,
                    Type = hpf.ContentType
                });
            }
            return Json(r);
        }
        private string GetNewPathForDupes(string path)
        {
            string directory = Path.GetDirectoryName(path);
            string filename = Path.GetFileNameWithoutExtension(path);
            string extension = Path.GetExtension(path);
            int counter = 1;
            string newFullPath;
            do
            {
                string newFilename = "{0}({1}){2}".FormatWith(filename, counter, extension);
                newFullPath = Path.Combine(directory, newFilename);
                counter++;
            } while (System.IO.File.Exists(newFullPath));
            return newFullPath;
        } 

我的HTML和javascript代码:

$(document).ready(function () {
            $('#fileupload').fileupload({
                dataType: 'json',
                url: "/StoreManager/UploadFiles",
                autoUpload: true,
                done: function (e, data) {
                    var json = data.result[0];
                    $("#picurl").val(json['Name']);
                    $('.file_name').html(json['Name']);
                    $('.file_type').html(json['Type']);
                    $('.file_size').html(json['Length']);
                }
            }).on('fileuploadprogressall', function (e, data) {
                var progress = parseInt(data.loaded / data.total * 100, 10);
                $('.progress .progress-bar').css('width', progress + '%');
            });
        });

@using (Html.BeginForm())
{
    @Html.AntiForgeryToken()
    <div class="form-horizontal">
        <h4>Footwear</h4>
        <hr />
        @Html.ValidationSummary(true)
        @Html.HiddenFor(model => model.FootwearId)
        <div class="form-group">
            @Html.LabelFor(model => model.Name, new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Name)
                @Html.ValidationMessageFor(model => model.Name)
            </div>
        </div>
        <div class="form-group">
            @Html.LabelFor(model => model.Price, new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Price)
                @Html.ValidationMessageFor(model => model.Price)
            </div>
        </div>
        <div class="form-group">
            @Html.LabelFor(model => model.FootwearPicUrl, new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.TextBoxFor(model => model.FootwearPicUrl, new { @id = "picurl", @readonly = "readonly" })
                @Html.ValidationMessageFor(model => model.FootwearPicUrl)
            </div>
        </div>
        <div class="form-group">
            @Html.LabelFor(model => model.Colour, new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Colour)
                @Html.ValidationMessageFor(model => model.Colour)
            </div>
        </div>
        <div class="form-group">
            @Html.LabelFor(model => model.DepartmentId, "DepartmentId", new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.DropDownList("DepartmentId", String.Empty)
                @Html.ValidationMessageFor(model => model.DepartmentId)
            </div>
        </div>
        <div class="form-group">
            @Html.LabelFor(model => model.BrandId, "BrandId", new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.DropDownList("BrandId", String.Empty)
                @Html.ValidationMessageFor(model => model.BrandId)
            </div>
        </div>
        <div class="form-group">
            <div class="col-md-offset-2 col-md-10">
                <input type="submit" value="Save" class="btn btn-default" />
            </div>
        </div>
    </div>
}
<span class="btn btn-success fileinput-button">
    <i class="glyphicon glyphicon-plus"></i>
    <span>Add files...</span>
    <input id="fileupload" type="file" name="files[]">
</span>
<br />
<div class="progress">
    <div class="progress-bar" role="progressbar" aria-valuenow="0" aria-valuemin="0" aria-valuemax="100" style="width: 0%;">
        <span class="sr-only">0% complete</span>
    </div>
</div>
<br />
<div class="file_name"></div>
<br />
<div class="file_type"></div>
<br />
<div class="file_size"></div>