Error in installing opening tidyverse: there is no package called ‘timechange’

You should not include install commands on Rmd files. Package installation has to be done interactively on the R console.

Please post the complete console output you get when you run this command on the R console

install.packages("timechange")

Also, please do not post screenshots, they are considered a bad practice here, post the console output as formatted code instead. Here is how to do it: