[R] R help: fviz_nbclust’ is not available (for R version 3.5.2)

[N Meriam]

Hello,
I'm struggling to install a function called "fviz_nbclus".

My code is the following:
pkgs <- c("factoextra",  "NbClust")
install.packages(pkgs)
library(factoextra)
library(NbClust)
# Standardize the data
load("df4.rda")
library(FunCluster)

install.packages("fviz_nbclust")
#fviz_nbclust(df4, FUNcluster, method = c("silhouette", "wss", "gap_stat"))

Installing package into ‘C:/Users/DELL/Documents/R/win-library/3.5’
(as ‘lib’ is unspecified)
Warning in install.packages :
  package ‘fviz_nbclust’ is not available (for R version 3.5.2)

Best,
Meriam