ggplot code argument returns error even when copied directly from Google certificate material

General
1

I tried to practice along with the lessons of Google certificate on ggplot2, the codes are not working.
At first, I memorize and relayed it, not working. Even when I copied it directly as rendered.

What could be the cause? I installed the ggplot packages and its library

I keep getting error below as screenshotted.

image
image1366×768 140 KB

2

Seems you.didnt execute the library(ggplot2) command that is present in your script

3

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