How do I fix font error when using ggcorrplot?

I tried to reproduce this code:

# Mendeteksi peubah - peubah yang saling berkorelasi secara kuat
korelasi <- cor(df) # menghitung koefisien korelasi

Yet I got this result:

enter image description here

And I tried to install mscorefonts on my OS, still got this font error. Does anybody know how to fix this error? Thanks.