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

> base::assign(".ptime", proc.time(), pos = "CheckExEnv")
> ### Name: ggmap.feature
> ### Title: Create a map with ggplot2
> ### Aliases: ggmap.feature
> 
> ### ** Examples
> 
> ggmap.feature(c("Adyghe", "Russian"))
Warning: PROJ support is provided by the sf and terra packages among others
Warning: Use of `mapfeat.df$long` is discouraged.
ℹ Use `long` instead.
Warning: Use of `mapfeat.df$lat` is discouraged.
ℹ Use `lat` instead.
Error:
! Problem while converting geom to grob.
ℹ Error occurred in the 3rd layer.
Caused by error in `new_data_frame()`:
! `n` must be an integer of size 1.
Backtrace:
     ▆
  1. ├─base (local) `<fn>`(x)
  2. ├─ggplot2:::print.ggplot(x)
  3. │ ├─ggplot2::ggplot_gtable(data)
  4. │ └─ggplot2:::ggplot_gtable.ggplot_built(data)
  5. │   └─ggplot2:::by_layer(...)
  6. │     ├─rlang::try_fetch(...)
  7. │     │ ├─base::tryCatch(...)
  8. │     │ │ └─base (local) tryCatchList(expr, classes, parentenv, handlers)
  9. │     │ │   └─base (local) tryCatchOne(expr, names, parentenv, handlers[[1L]])
 10. │     │ │     └─base (local) doTryCatch(return(expr), name, parentenv, handler)
 11. │     │ └─base::withCallingHandlers(...)
 12. │     └─ggplot2 (local) f(l = layers[[i]], d = data[[i]])
 13. │       └─l$draw_geom(d, layout)
 14. │         └─ggplot2 (local) draw_geom(..., self = self)
 15. │           └─self$geom$draw_layer(data, self$geom_params, layout, layout$coord)
 16. │             └─ggplot2 (local) draw_layer(..., self = self)
 17. │               └─base::lapply(...)
 18. │                 └─ggplot2 (local) FUN(X[[i]], ...)
 19. │                   ├─rlang::inject(self$draw_panel(data, panel_params, coord, !!!params))
 20. │                   └─self$draw_panel(...)
 21. │                     └─ggplot2 (local) draw_panel(...)
 22. │                       └─ggplot2:::dapply(...)
 23. │                         └─base::lapply(...)
 24. │                           └─ggplot2 (local) FUN(X[[i]], ...)
 25. │                             └─ggplot2 (local) apply_fun(cur_data)
 26. │                               └─ggplot2 (local) fun(x, ...)
 27. │                                 └─vctrs::new_data_frame(...)
 28. └─rlang::abort(message = message)
Execution halted