Hello Everyone,

I have a website that is developed in DNN 4.9 and uses visual studio 2008 and sql server 2005.I want to upgrade that into DNN 9.2.

When i tried to upgrade that into DNN 9.2 it give me some errors, one of error is something like that-

Exception Details:System.ArgumentNullException: Collection cannot be null.
Parameter name: c

I don't know why this error is coming.

Can some one please help me in that?

I think we can upgrade DNN 4.9 to 9.2 ?