This suggest that either you have not updated R or that you have selected an older version, current version is 3.6.1 and it seems like you are using 3.3 version.
What is the complete message do to get when you run this command?
install.packages("pillar", repos='http://cran.rstudio.com/')
What is the result of running?
.libPaths()
Do you have modified your Rprofile.site file or do you have a .Rprofile file in your working directory?
If so, what is the content of that file?