Can not Upload image by Inline Editor

Hi guys, I am trying to use Inline Editor to upload an image (only 6 KB) from my device local but its response failed with the status "Server responded with 0 code".

This is my code below:

ImageUploaderEditorViewModel : InlineEditorViewModel

public string GetDataUrl()
{
var urlHelper = new UrlHelper(HttpContext.Current.Request.RequestContext);
if (ImageType == ImageTypeEnum.Attachment)
{
    return urlHelper.Kentico().AuthenticateUrl(urlHelper.Action("Upload", "ImageUploader", new{
        pageId = HttpContext.Current.Kentico().PageBuilder().PageIdentifier
    }), false).ToString();
}

if (ImageType == ImageTypeEnum.MediaFile)
{
    return urlHelper.Kentico().AuthenticateUrl(urlHelper.Action("Upload", "MediaFileImageUploader",new{
    libraryName = MediaLibraryName
}), false).ToString();
}

return null;
}

**_ImageUploaderEditor.cshtml**

@using (Html.Kentico().BeginInlineEditor("image-uploader-editor", Model.PropertyName,
new
{
    @class = "image-uploader-editor",
    data_url = Model.GetDataUrl(),
    data_file_type = Model.ImageType == ImageTypeEnum.MediaFile ? "media" : "attachment"
}))
{
<div class="@GetContainerClass()">
    <div class="uploader">
        <div class="dz-message @GetMessagePositionClass()">
            <i class="icon-arrow-up-line"></i>
            <div>
               @Model.TextMessage <a class="dz-clickable">click</a> to browse
            </div>
        </div>
    </div>
</div>
}

I am not sure there is anything wrong here or if I missed any config. Can anyone have an idea what is the issue I get?