Have to built solution before debugging

I develop a ASP MVC site, when I press F5 to debug, VS appear a notice error (as picture). If built solution, then debug, that err开发者_如何学JAVAor don't appear.

Plz help me fix this error

alt text http://img692.imageshack.us/img692/1969/screenhunter02jul051427.gif

The error appears to be a Castle.Windsor configuration error. Are you sure your application has the correct configuration section?

Check the Castle.Windsor references in your project. Also check the web.config for your Castle.Windsor configuration, may be one of the types haven't been mentioned properly. Try putting in the fully qualified name like "Castle.Windsor.Configuration.AddDomain.CastleSectionHandler"