Error: save mapview to .png

Hello, I try save a mapview in .png format and show me the following error:
v<-mapview(GFmap, zcol=c("COT"),alpha=0, col.regions =cols)
mapshot(v, file = paste0(getwd(), "/map.png"))

Error in (function (widget, file, selfcontained = TRUE, libdir = NULL,
Saving a widget with selfcontained = TRUE requires pandoc. For details see:

Any suggestions please?

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