Use the console pane
library(KoNLP)
If it loads, then yes, you probably have a shiny problem.
But if it throws the error message
Error in library("KoNLP") : there is no package called ‘KoNLP’
then you need to
install.packages("KoNLP")
I just did this on Mojave without problem; Ubuntu and friends should also be ok. About Windows, I can't say since I so seldom use it.