Error when I try to predict class probabilities in R - caret

Question

I\'ve build a model using caret. When the training was completed I got the following warning:

Warning message: In train.default(x, y, weights = w, ...) : A

Answer 1

I have read through the answers above while facing a similar problem. A formal solution is to do this on the train and test datasets. Make sure you include the response variable in the feature.names too.

feature.names=names(train)

for (f in feature.names) {
  if (class(train[[f]])=="factor") {
    levels <- unique(c(train[[f]]))
    train[[f]] <- factor(train[[f]],
                   labels=make.names(levels))
  }
}

This creates syntactically correct labels for all factors.