Error CS0501 and SharePoint

Last week when deploying some SharePoint solutions, I got error CS0501 thrown on my plate: ULS told me nothing more: System.Web.HttpCompileException: c:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14\TEMPLATE\LAYOUTS\ep\EPErrorPage.aspx(16): error CS0501: ‘ASP._layouts_ep_eperrorpage_aspx.UseDefaultResourceValue.get’ must declare a body because it is not marked abstract or extern Advertisements