After the successfully installation "DotNetNuke_Community_07.00.04_Install" i run the application but i had an issue with the UI.Skins.Skin.GetSkin(this) in default.aspx page it throw an Null Reference Exception, i had try to search for that but did not find any proper solution, and still i continue for searching, i am new in DotNetNuke, have any one proper solution for that.