Fresh install of DNN 05.05.00 (653), installed Smith.BuyNow03.03.00-DNN5.zip. Install went fine. Copied license files to web root. Inserted a BuyNow module - so far so good. Tried to go to the module's Settings page, and got:

A critical error has occurred.
Object reference not set to an instance of an object.

Site event viewer reports inner exception:

The base class includes the field 'Label9', but its type (System.Web.UI.HtmlControls.HtmlGenericControl) is not compatible with the type of control (System.Web.UI.WebControls.Label).

Hosted server (DiscountASP.Net) using ASP.Net version 4.0, Application Pool Pipeline mode = Integrated.

Can you help?

Our developers use vs2008 and compile against the dot net 3.5 framework I googled the error and found that if you are running dot net framework 4 you need to add a setting to your web config to run apps built in 3.5

Here is a link to the article:

http://www.asp.net/learn/whitepapers/aspnet4/breaking-changes#0.1__Toc256770141

-Scott

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Scott Kelly
Project Manager