Can people with the problem try and provide a bit more detail please. The filemanager works for many thousands of users, there are only a few reporting issues, and I don't know of any coreteam member who's recreated this problem. The error "Object reference not set to an instance of an object" at times is virtually useless in providing a way to diagnose problems, as often all it indicates is that the application expected to find a value in a variable, but the variable was unitialised. This indicates a problem where an eventuality that hasn't been factored into the code happens e.g. the following code works fine, except when intBottom is zero

Dim intResult As Integer = intTop \ intBottom

Typically these problems are mssing expected resources (files/database connections),edge cases and overflows. I know of one with the filemanager where the variable assigned to hold the portal size is an integer, which can hold a maximum size of 2147483647, so if a portal is larger than 2GB it overflows and causes an error. This has been fixed for the next version. Can you check and see if your portal falls into this category?

If this is not the issue, take a look and see if you have unusual files/folders e.g. exceptionally long filenames/foldernames may be the issue. Ideally if you could attach a debugger then you can step through the code and see what the issue is - we would be grateful if you could post back the details if you work out what it is - as I mentioned, it's hard to fix something when you can't recreate it.

Cathal

I'm presuming you don't have vs.net installed on the same machine as the site - if you do, use it. If not, you can use either DbgClr or Cordbg (I'd recommend DbgClr )

using Dbgclr
http://www.mdibb.net/net/debugging_aspnet_without_visual_studio_using_dbgclr/ and http://msdn2.microsoft.com/en-US/library/7zxbks7z.aspx

use Cordbg.exe
http://windowssdk.msdn.microsoft.com/library/default.asp?url=/library/en-us/dv_winfxdevtools/html/990785ba-e310-4a68-8a64-a2b658949dae.asp

Cathal

Thanks for getting us some information Cathal. Below is the error that I have been receiving each time I visit the File Manager page as both Admin and Host using DNN 4.0.3.

Module Load Exception #1 (File Manager)

ModuleId: -1
ModuleDefId: -1
FriendlyName:
ModuleControlSource:
AssemblyVersion: 04.00.03
Method: System.Web.Compilation.BuildManager.CompileWebFile
FileName:
FileLineNumber: 0
FileColumnNumber: 0
PortalID: 0
PortalName: Oswego Speedway
UserID: 2
UserName: admin
ActiveTabID: 46
ActiveTabName: File Manager
AbsoluteURL: /Default.aspx
AbsoluteURLReferrer:
ExceptionGUID: 3b9cd63b-2439-4115-bb04-9f0ae74ad998
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
InnerException: C:\Inetpub\DotNetNuke_4\Admin\Files\FileManager.ascx.vb(314): error BC30456: 'Key' is not a member of

'System.Web.UI.WebControls.TreeNode'.
Message: DotNetNuke.Services.Exceptions.ModuleLoadException: C:\Inetpub\DotNetNuke_4\Admin\Files\FileManager.ascx.vb(314):

error BC30456: 'Key' is not a member of 'System.Web.UI.WebControls.TreeNode'. ---> System.Web.HttpCompileException:

C:\Inetpub\DotNetNuke_4\Admin\Files\FileManager.ascx.vb(314): error BC30456: 'Key' is not a member of

'System.Web.UI.WebControls.TreeNode'. 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.UI.TemplateControl.LoadControl(VirtualPath

virtualPath) at System.Web.UI.TemplateControl.LoadControl(String virtualPath) at

DotNetNuke.UI.Skins.Skin.InjectModule(Control objPane, ModuleInfo objModule, PortalSettings PortalSettings) --- End of

inner exception stack trace ---

Module Load Exception #2 (File Manager)

ModuleId: -1
ModuleDefId: -1
FriendlyName:
ModuleControlSource:
AssemblyVersion: 04.00.03
Method: System.Web.UI.UserControl.get_Request
FileName:
FileLineNumber: 0
FileColumnNumber: 0
PortalID: 0
PortalName: Oswego Speedway
UserID: 2
UserName: admin
ActiveTabID: 46
ActiveTabName: File Manager
AbsoluteURL: /Default.aspx
AbsoluteURLReferrer:
ExceptionGUID: 3232f0d7-0b4f-49bd-a476-18958f6d1e52
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
InnerException: Object reference not set to an instance of an object.
Message: 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

System.Web.UI.UserControl.get_Request() at DotNetNuke.Entities.Modules.PortalModuleBase.get_IsEditable() at

DotNetNuke.UI.Containers.Title.CanEditModule() at DotNetNuke.UI.Containers.Title.Page_Load(Object sender, EventArgs e) ---

End of inner exception stack trace ---