ggplot2 Error in R: Insufficient values in manual scale. N needed but only M provided. (2 Examples)

data(iris)                     # Example data
head(iris)
#   Sepal.Length Sepal.Width Petal.Length Petal.Width Species
# 1          5.1         3.5          1.4         0.2  setosa
# 2          4.9         3.0          1.4         0.2  setosa
# 3          4.7         3.2          1.3         0.2  setosa
# 4          4.6         3.1          1.5         0.2  setosa
# 5          5.0         3.6          1.4         0.2  setosa
# 6          5.4         3.9          1.7         0.4  setosa

data(iris) # Example data head(iris) # Sepal.Length Sepal.Width Petal.Length Petal.Width Species # 1 5.1 3.5 1.4 0.2 setosa # 2 4.9 3.0 1.4 0.2 setosa # 3 4.7 3.2 1.3 0.2 setosa # 4 4.6 3.1 1.5 0.2 setosa # 5 5.0 3.6 1.4 0.2 setosa # 6 5.4 3.9 1.7 0.4 setosa

install.packages("ggplot2")    # Install ggplot2 package
library("ggplot2")             # Load ggplot2

install.packages("ggplot2") # Install ggplot2 package library("ggplot2") # Load ggplot2

my_plot <- ggplot(iris,        # Default colors
              aes(x = Species,
                  y = Petal.Length,
                  fill = Species)) +
  geom_boxplot()
my_plot

my_plot <- ggplot(iris, # Default colors aes(x = Species, y = Petal.Length, fill = Species)) + geom_boxplot() my_plot

my_plot +                      # Not enough colors
  scale_fill_manual(values = c("red",
                               "green"))
# Error: Insufficient values in manual scale. 3 needed but only 2 provided.

my_plot + # Not enough colors scale_fill_manual(values = c("red", "green")) # Error: Insufficient values in manual scale. 3 needed but only 2 provided.

my_plot +                      # Same amount of boxes & colors
  scale_fill_manual(values = c("red",
                               "green",
                               "orange"))

my_plot + # Same amount of boxes & colors scale_fill_manual(values = c("red", "green", "orange"))