'NbClust not showing any result when i run my code on RStudio

So here is my code. I want to know how many clusters that is optimal using the Single-Linkage Method. I have already installed the package for NbClust. But, when I run my code NbClust does not show anything as I showed in the picture. Does anyone know why this happened?

library("readxl")
data <- read_excel("z_housing.xlsx")    

install.packages("NbClust")
library(NbClust)
data.s <- scale(data[,-1:-2])
data.s
NbClust(data = data.s, distance = "euclidean",
        min.nc = 2, max.nc = 15, method = "single", index = "all", alphaBeale = 0.1)

Here is the result:

r hierarchical-clustering

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'NbClust not showing any result when i run my code on RStudio

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