Error in GGREPEL OR GGPLOT2

library(ggrepel)
Error: package ‘ggplot2’ required by ‘ggrepel’ could not be found
In addition: Warning message:
package ‘ggrepel’ was built under R version 3.3.3

I have been trying to download the packages. And it always turns out error.
Anyone know how to fix and suggestion of this? Or should I re-install my RStudio?

Run

install.packages("ggplot2")

and try again...?