I get this error then I try to compile my project after upgrading from 5.3 to 6.0 (the error was in swedish so I translated it, so it may not be the same in english).

gecko_insertdocument.frame.aspx: Baseclass does not include the field InputFile but there type (CuteEditor.UploadSingleFile) is not compatible with the controltype (System.Web.UI.HtmlControls.HtmlInputFile).

Any help is appreciated!