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DotNetNuke - Error: File Manager is currently unavailable.

Error: File Manager is currently unavailable. DotNetNuke.Services.Exceptions.ModuleLoadException: Object reference not set to an instance of an object. ---> System.NullReferenceException: Object reference not set to an instance of an object. at DotNetNuke.Services.FileSystem.FolderProvider.Instance(String friendlyName) at DotNetNuke.Services.FileSystem.FolderMappingInfo.get_ImageUrl() at DotNetNuke.Modules.Admin.FileManager.FileManager.PreloadFolderImages() at DotNetNuke.Modules.Admin.FileManager.FileManager.InitializeTree() at DotNetNuke.Modules.Admin.FileManager.FileManager.OnLoad(EventArgs e) --- End of inner exception stack trace ---



  1. Open the file in a text editor DesktopModules/Admin/FileManager/FileManager.aspx.cs 
  2. Locate the function : PreloadFolderImages()
  3. and make the following highlighted changes.

private void PreloadFolderImages()
            IFolderMappingController folderMappingController = FolderMappingController.Instance;
            FolderMappingInfo folderMappingInfo = null;
            string imageUrl = String.Empty;

            foreach (var folderMapping in FolderMappings)

                folderMappingInfo = folderMappingController.GetFolderMapping(folderMapping.Key);
                imageUrl = folderMappingInfo.ImageUrl;
                catch {}


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  1. Senior Engineer Jessie

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