example_r_notebook.ipynb failed CI

Link to the notebook:
https://github.com/aws/amazon-sagemaker-examples/blob/master/advanced_functionality/r_kernel/example_r_notebook.ipynb

Error:

---------------------------------------------------------------------------
Exception encountered at "In [1]":
---------------------------------------------------------------------------
NameError Traceback (most recent call last)
in
----> 1 library(ggplot2)
2 library(randomForest)

NameError: name 'library' is not defined

Start with advanced_functionality/r_kernel/example_r_notebook.ipynb and inspect its kernel metadata and the CI execution context. Reproduce the first cell, which fails at library(ggplot2), then verify that the notebook runs with the intended R kernel and that CI completes successfully.

Written by the indexing model from the issue text.