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Auto login with AD not working


SO I have a new install of DNN and the lastest module of DNN AD Authentication 5.06
actually my boss installed and told me to look into it..
Any how auto login does not work , when I go to the windows authentication page I get error:
Server error in '/' application

had worked through this article and sill no joy, where do I begin to troubleshoot? is there a good docuemnt on this?