Getting invalid model formula in ExtractVars when using rpart function in R

The dataset can be downloaded from http://archive.ics.uci.edu/ml/machine-learning-databases/wine-quality/

Getting the following error:

formula(formula, data = data) : 
  invalid model formula in ExtractVars

Using the following code:

install.packages("rpart")
library("rpart")

# you'll need to change the following from windows to work on a linux box:
mydata <- read.csv(file="c:/Users/md7968/downloads/winequality-red.csv")

# grow tree 
fit <- rpart(YouSweetBoy ~ "residual sugar" + "citric acid", method = "class", data = mydata

Mind you I’ve changed the delimiters in the CSV file to commas.

perhaps it’s not reading the data correctly. Forgive me, I’m new to R and not a very good programmer.

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