I have just upgraded my site from 3.2.x to 4.8.4 by following the instructions at
http://www.mitchelsellers.com/Blogs/tabid/54/articleType/ArticleView/articleId/106/Upgrading-DNN-3x-to-DNN-4x.aspx

The problem is that if I now go to localhost/default.aspx?ctl=login I get an 'object reference not set to an
instance of an object' error. The original 3.2 site does not give me this error so I guess something broke after
upgradation.

- How do I verify if the upgrade was successfull
- Is there some sort of a log with a stack trace which I can examine which would give me a clue as to why the
login page is not coming up.
- Could this be caused by a wrong setting in the machine key in web.config.
I have copied the old key to web.config as it is:

I notice 4.8 has some new options like validationKey="AutoGenerate,IsolateApps" and decryption="3DES"
do I need to merge these in?
- Should I compile and run the DNN 4.8 site through Visual Studio 2005 to debug. Is there some documentation on how to compile the solution

During upgrade I received an error message saying 04.04.00.log Error:HelpURL
The upgrade seemed to have completed successfully though.
I looked at the .SqlData file and I found that 'vw_Modules' had been created in my database.

Thanks,

Deepak