Code window not updating

In the census project (pro project for Unit 3 in “Learn R”), the code window will not update no matter what I do. That is, usually my code itself gets printed in the right pane even if the code does not produce any printed output. All I have so far is

library(readr)
library(diplyr)
library(tidyr)

So I don’t think this can be because of a mistake in my code. I am using google chrome. Any ideas for what could be wrong? This is very frustrating.
(https://www.codecademy.com/courses/learn-r/projects/r-data-cleaning-us-census)

Sigh. I know the problem – it’s “dplyr” not “diplyr.” Completely my fault, but I sure wish mistakes like that would produce some kind of error message!