Error Message in Visual Studio

I am getting the开发者_如何学编程 following error message when i press on the Start Debugging button: "There were deployment errors. Continue ?" Any idea why this error message is showing ?

Right click on the Solution you are working with > Configuration Manager > Un-check all the Deploy checks.

Something have a reference to the file it is trying to deploy? I used to sometimes get this on Windows Mobile projects when I ran it on the device or it didn't shutdown properly.