Chapter 6, Figure 6.1 code chunks 18 and 19 have an error

[m-hefnawy]

I am running the codes of chapter 6. I am using R version 4.02

while running the code on my local machine I got an error

"Error: x must be a vector, not a data.frame/partial object."

I believe there is an issue in pdp package.

I can run the code and produce the charts flawlessly on RStudio cloud.

Regards, Mohamed.