Error in default + theme : non-numeric argument to binary operator

As @sebammers mention this should work. See below. I could reprex it:

library(tidyverse)

ggplot(iris, aes (x = Sepal.Length,
                  y = Sepal.Width,
                  col = Species)) +
  geom_point()

Created on 2022-01-19 by the reprex package (v2.0.1)