Hi,
I'm having a site in Dot Net Nuke. The site has been working properly from the last 5 months but a few days ago when I click on Admin->File Manager it is showing the following error;

DotNetNuke Error: - Version 04.05.05 An error has occurred. DotNetNuke.Services.Exceptions.PageLoadException: Object reference not set to an instance of an object. ---> System.NullReferenceException: Object reference not set to an instance of an object. at DotNetNuke.Security.Permissions.Controls.FolderPermissionsGrid.SaveViewState() at System.Web.UI.Control.SaveViewStateRecursive() at System.Web.UI.Control.SaveViewStateRecursive() at System.Web.UI.Control.SaveViewStateRecursive() at System.Web.UI.Control.SaveViewStateRecursive() at System.Web.UI.Control.SaveViewStateRecursive() at System.Web.UI.Control.SaveViewStateRecursive() at System.Web.UI.Control.SaveViewStateRecursive() at System.Web.UI.Control.SaveViewStateRecursive() at System.Web.UI.Control.SaveViewStateRecursive() at System.Web.UI.Control.SaveViewStateRecursive() at System.Web.UI.Control.SaveViewStateRecursive() at System.Web.UI.Control.SaveViewStateRecursive() at System.Web.UI.Control.SaveViewStateRecursive() at System.Web.UI.Control.SaveViewStateRecursive() at System.Web.UI.Control.SaveViewStateRecursive() at System.Web.UI.Page.SaveAllState() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) --- End of inner exception stack trace ---

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Can you please help me.
Thanks.

Did you make any site changes prior to taht happening?

Hi,
I only added content in the site. noting beyond that.

I don't have a solution for you, but ... if you haven't already done so ... you might want to Restart DotNetNuke from the Host menu, or even reboot the web server machine if that option is open to you.

Is this the same problem you have mentioned earlier? please try to keep the same problem within the same thread

I responded with:

I had a similar problem in an earlier version of DotNetNuke, I fixed it by deleting all of the content from the Files table, returning back to the FileManager and selecting Synchronize recursive.

BEFORE attempting this I would suggest you download your live website, install it on a localhost installation and run the test on a local installation. BACKUP everything.

As a first test however, I would try upgrading on a localhost installation copy and see if the upgrade fixes the problem.

- It seems as though you are getting a lot of errors as previously you mentioned you also getting menu errors, adding pages / module errors, are these all on the same installation. - If they are please put together all of the errors you are getting in one post to make it easier for us to work out what the problem is - it sounds as though you may have a corrupt installation if that is the case.

Thanks,