I have a visual webpart having chart,Whenever chart is added to the design part its giving a warning " Element 'Chart' is not a known element. This can occur if there is a compilation error in the Web site, or the web.config file is missing",But it get deployed fine.But while trying to access the page where i have deployed the visual webpart with chart i am getting a 403 forbidden error message.
Any Pointers will be helpfull.