I am naive in R markdown. I found my code works well in R and give outputs properly. However, when I am run them in R Markdown, the process stops at a line
err.vect[i] eval -> eval -> roc.area -> Summary.factor Execution halted.
```{r}
for (i in 1:k){
s1 = ((i-1) * n+1) # the start of the subset
s2 = (i*n) # The end of the subset
subset = s1:s2 # the range of the subset
cv.train=rh.df[-subset,] # Train the model using this data
cv.test = rh.df[subset, ] # test the model's performace on this data
# run the random forest on the training data set, exclude on predictor variables
fit = randomForest (x=cv.train[,-c(1,2,3,32)], y= as.factor (cv.train[,32]))
prediction = predict (fit, newdata= cv.test[, -c(1,2,3,32)], type="prob")[,2]
# calculate the model's accurancy for the ith fold
err.vect[i]