Dear all, Can somebody give me a clue why I always get the following error? errorest(Species ~ ., data = iris, model = knn, estimator = "cv")$err Error in model(formula, data = folddata, ...) : unused argument(s) (data ...) Xin LIU This e-mail is from ArraDx Ltd The e-mail and any files transmitted with it are confidentia...{{dropped}}