It appears that I am having the same or similar problem 563 to 6.01 File manager now displays the following error.

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 ---


Any ideas?

Thanks! Sadly that doesn't fix it.

Adjusting the code to
private void PreloadFolderImages()
        {
            IFolderMappingController folderMappingController = FolderMappingController.Instance;
            FolderMappingInfo folderMappingInfo = null;
            string imageUrl = String.Empty;

            foreach (var folderMapping in FolderMappings)
   {
    Try
    {
                folderMappingInfo = folderMappingController.GetFolderMapping(folderMapping.Key);
                imageUrl = folderMappingInfo.ImageUrl;
                DNNTree.ImageList.Add(imageUrl);
    }
    catch{}
   }
        }

results in:

Error: File Manager is currently unavailable. DotNetNuke.Services.Exceptions.ModuleLoadException: c:\inetpub\vhosts\d13cgaux.com\httpdocs\sites\DesktopModules\Admin\FileManager\FileManager.ascx.cs(825): error CS1002: ; expected ---> System.Web.HttpCompileException: c:\inetpub\vhosts\d13cgaux.com\httpdocs\sites\DesktopModules\Admin\FileManager\FileManager.ascx.cs(825): error CS1002: ; expected at System.Web.Compilation.BuildManager.CompileWebFile(VirtualPath virtualPath) at System.Web.Compilation.BuildManager.GetVPathBuildResultInternal(VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile) at System.Web.Compilation.BuildManager.GetVPathBuildResultWithNoAssert(HttpContext context, VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile) at System.Web.Compilation.BuildManager.GetVPathBuildResult(HttpContext context, VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile) at System.Web.UI.TemplateControl.LoadControl(VirtualPath virtualPath) at System.Web.UI.TemplateControl.LoadControl(String virtualPath) at DotNetNuke.UI.ControlUtilities.LoadControl[T](TemplateControl containerControl, String ControlSrc) at DotNetNuke.UI.Modules.WebFormsModuleControlFactory.CreateModuleControl(TemplateControl containerControl, ModuleInfo moduleConfiguration) at DotNetNuke.UI.Modules.ModuleControlFactory.LoadModuleControl(TemplateControl containerControl, ModuleInfo moduleConfiguration) at DotNetNuke.UI.Modules.ModuleHost.LoadModuleControl() --- End of inner exception stack trace ---


Other ideas?

Thank you,

This work for me, But just in Host/FileManager.
I have Problem in Admin/FileManager. (object reference).

do you have any idea??