Issue with RgoogleMaps example

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When I try to plot the points,
PlotOnStaticMap(lat = c(36.3, 35.8, 36.4), lon = c(-5.5, -5.6, -5.8), zoom = 10, cex = 4, pch = 19, col = "red", FUN = points, add = F)

I get the message:
Error in MaxZoom(latR, lonR, size) :
  argument "size" is missing, with no default
