Semi-variogram plot does not show

I am trying to create a semivariogram map on my Mac but anytime I run this code = plot(CloudV, main = "Semivariogram cloud", pch='+', col="red", xlab="Distance (m)", ylab="Semi-variance"), it runs for sometime and then nothing shows. The other plots I already created do not show as well and everything crashes.I already run all the packages. Can anyone help with this ???

You represent your issue as though no plot can be shown at all. Is that right ?
if you open a new session and run

plot(cars)
lines(lowess(cars))

do you get the expected output ?