I have faced that error when i have setup once again after formating my system. I have used whole code in seperate folder and run the sql scripts with data and schema as well and set right connection string in web.config section. finally make a website in IIS 7.5 and when accessing it like http://localhost/ . I have install nuget also but still i have found this error

Could not load type 'umbraco.ACSExtensions.CustomWSFederationAuthenticationModule'.

Please guide me how can i overcome from this error so that i can feel cool

regards