Problem while computing aesthetics in knitting r-markdown

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1

I have just started learning R for visualization .
I have installed and loaded ggplot2 package and the penguin dataset, but while trying to knit the R Markdown doc, I'm getting the below error:
Error in geom_point():
! Problem while computing aesthetics.
:information_source: Error occurred in the 1st layer.
Caused by error:
! object 'flipper_length_mm' not found

This is the code:

ggplot(data = penguins) +
  geom_point(mapping = aes(x = flipper_length_mm, y = body_mass_g, color = species)) +
  labs(title = "Penguins:Body_mass vs Flipper_length", subtitle = "Sample of three penguins", caption = "Data collected by Dr. Kristen")+
  annotate("text", x = 220, y = 3500, label = "Gentoos are the largest", color = "Blue", fontface = "italic", size = 4.5)

Can anyone please help me out? Thanks in advance!

2

Unless you modified the penguin dataset, you have two incorrect column names. The correct names are flipper_len (not flipper_length_mm) and body_mass (not body_mass_g).