I cannot set/change my working directory directly in my R code. Instead, I have to manually set it in the file browser tab

Question

For some reason, I am unable to set or change my working directory in my R-code itself. I'll include a line such as:

setwd("~/Documents/BeaverProject/HOBOData/Beav")

But it will be followed with an error:

Error in setwd("~/Documents/BeaverProject/HOBOData/Beav") : 
  cannot change working directory

However, if I go to the file browser tab in the bottom right corner, and click "(gear icon) More", it provides an option to "Set as Working Directory" which I can use to change the working directory to the desired file folder.

While this works, it means that I can't just sit back and allow my code sequence to run because I have to manually change the working directory at every point in the code where it needs to.

Any suggestions?