Ошибка в примере избыточной выборки в R

Question

Я бегу ниже код для передискретизации в R

varNames1 = paste0("Quote.Type","+","Quote.State","+","Forecast.Type","+","Suggested.Reseller.Discount","+","Territory","+","Pricing.Type")

ctrl <- trainControl(method = "repeatedcv", 
                                           number = 10, 
                                           repeats = 10, 
                                           verboseIter = FALSE,
                                           sampling = "up")

set.seed(42)
model_rf_under <- caret::train(renew.dev$Result ~ varNames1,
                               data = renew.dev,
                               method = "rf",
                               preProcess = c("scale", "center"),
                               trControl = ctrl)

Для меня это ошибка ниже. Может кто-нибудь, пожалуйста, помогите.

Error in model.frame.default(form = renew.dev$Result ~ varNames1, data = renew.dev,  : 
  variable lengths differ (found for 'varNames1')