"wrong model type for regression" when attempting multinomial model with caret

Question

Tried running this code multiple different times and in different ways but still getting error.

library(caret)

model_multinom <- train(
  Group ~ GPA + GMAT, 
  data = train_data,
  method = "multinom", 
  trControl = trainControl(method = "none"), 
  preProcess = c("center", "scale"),
  na.action = na.omit
)

# Error: wrong model type for regression