I'm getting a similar error, but here is my situation:

It was working fine this morning,  I checked for updated modules.  I saw that there were upated Links and What's New Modules, so i installed them.  I got the new ASP.NET Controls and installed them on the server.  Went to go to the home page, and got:

Object reference not set to an instance of an object.

So, I set up debugging on the server and got the following error:

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:

Line 552:
Line 553:            ' set skin id to an explicit short name to reduce page payload and make it standards compliant
Line 554:            ctlSkin.ID = "dnn"
Line 555:
Line 556:            'Manage disabled pages

Any thoughts on what I can do to get it back?  I am going to try and replaced the DotNetNuke.WebControls.dll and all the js files with older ones and see how it goes.

Thanks,

NUZZI

i think i may have to just wipe the install and start clean again.

Chuck,

Probably the problem is concerned with selected authentication service. There are 3 services when you install dnn: default DNN, LiveID, OpenID.

Open  [Authentication] table and check that DNN service is enabled.

I had this problem and it was solved  when I set IsEnabled = true for DNN service.

Alex Putnam