Running examples in ‘ggiraph-Ex.R’ failed
The error most likely occurred in:

> base::assign(".ptime", proc.time(), pos = "CheckExEnv")
> ### Name: geom_sf_interactive
> ### Title: Create interactive sf objects
> ### Aliases: geom_sf_interactive geom_sf_label_interactive
> ###   geom_sf_text_interactive
> 
> ### ** Examples
> 
> # add interactive sf objects to a ggplot -------
> library(ggplot2)
> library(ggiraph)
> 
> ## original code: see section examples of ggplot2::geom_sf help file
> if (requireNamespace("sf",
+                      quietly = TRUE,
+                      versionCheck = c(op = ">=", version = "0.7-3"))) {
+   nc <- sf::st_read(system.file("shape/nc.shp", package = "sf"), quiet = TRUE)
+   gg <- ggplot(nc) +
+     geom_sf_interactive(aes(fill = AREA, tooltip = NAME, data_id = NAME))
+   x <- girafe(ggobj = gg)
+   if( interactive() ) print(x)
+ 
+   nc_3857 <- sf::st_transform(nc, "+init=epsg:3857")
+ 
+   # Unfortunately if you plot other types of feature you'll need to use
+   # show.legend to tell ggplot2 what type of legend to use
+   nc_3857$mid <- sf::st_centroid(nc_3857$geometry)
+   gg <- ggplot(nc_3857) +
+     geom_sf(colour = "white") +
+     geom_sf_interactive(aes(geometry = mid,
+         size = AREA, tooltip = NAME, data_id = NAME),
+       show.legend = "point")
+   x <- girafe( ggobj = gg)
+   if( interactive() ) print(x)
+ 
+   # Example with texts.
+   gg <- ggplot(nc_3857[1:3, ]) +
+     geom_sf(aes(fill = AREA)) +
+     geom_sf_text_interactive(aes(label = NAME, tooltip = NAME), color="white")
+   x <- girafe( ggobj = gg)
+   if( interactive() ) print(x)
+ 
+   # Example with labels.
+   gg <- ggplot(nc_3857[1:3, ]) +
+     geom_sf(aes(fill = AREA)) +
+     geom_sf_label_interactive(aes(label = NAME, tooltip = NAME))
+   x <- girafe( ggobj = gg)
+   if( interactive() ) print(x)
+ }
Error in loadNamespace(package, ...) : 
  'versionCheck' must be NULL or list with components 'op' and 'version'
Calls: requireNamespace
Execution halted