prediction using random forest model returned NA

  • when predicting the test sets in cross validation splits using randomforest function, it returns NA for all values in the response variable .
    here is the code I used for building the model:
    cv_model_tunerf <- cv_tune %>%
    mutate(model = map2(.x = train, .y = mtry, ~randomForest(formula = main_cat ~ . - sample_no., data = .x, ntree = 500, mtry = .y, importance = TRUE, na.action=na.roughfix, seed = 12345)))
    it works well.
  • here is the code I used for prediction
    cv_pred_rf <- cv_models_tunerf %>%
    mutate(validate_predicted = map2(.x = model, .y = validate, ~predict(.x, .y)))
    it returned NA for all predicted values.
    note: the dataset I am working on contains many misssing values.
    thank you in advance.

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