I've seen this error elsewhere but the soltuion does not work for me.

My v7 site has been working perfectly, i have the following code to render my home page banners.

@inherits UmbracoTemplatePage

@{
    var mediaFolderId = (int)CurrentPage.BannersMediaFolder;
}

@if (mediaFolderId > 0)
{
    var mediaFolder = Umbraco.TypedMedia(mediaFolderId);
    var banners = mediaFolder.Children(x => x.DocumentTypeAlias == "Banner").ToList();

    

        

            @foreach (var banner in banners)
            {
                var link = Umbraco.TypedContent(banner.GetPropertyValue("link"));

                

                    @if (link != null)
                    {
                        
                            
                        
                    } 
                    else
                    {
                        
                    }

                    

                        
@(banner.GetPropertyValue("headline"))
                        @(banner.GetPropertyValue("linktext")) 
                        
@Html.Raw(banner.GetPropertyValue("subheadline"))

                    
                
            }
        
    

    
<script src="/scripts/jquery.carouFredSel-6.2.1-packed.js" type="text/javascript"><!--mce:0--></script>

    
<script type="text/javascript"><!--mce:1--></script>
}

but now i get the Error: Object reference not set to an instance of an object. The only thing i have done is add another folder in my media folder...could this be connected?