Running examples in 'chronochrt-Ex.R' failed
The error most likely occurred in:

> ### Name: geom_chronochRt
> ### Title: A chronological chart
> ### Aliases: geom_chronochRt
> 
> ### ** Examples
> 
> 
> # Create example data
> library(ggplot2)
> 
> chrons <- data.frame(region = c("A", "B", "B", "B", "A"),
+                      name = c("a", "a", "1", "2", "b"),
+                      start = c(-100, -100, -100, "0/50", "50_100"),
+                      end = c("50_100", 150, "0/50", 150, 200),
+                      level = c(1, 1, 2, 2, 1),
+                      add = FALSE)
> 
> ggplot(chrons) +
+ geom_chronochRt(aes(name = name, region = region, level = level,
+                     start = start, end = end, add = add))
Error in `geom_chronochRt()`:
! Problem while converting geom to grob.
ℹ Error occurred in the 1st layer.
Caused by error in `draw_panel()`:
! object 'new_data_frame' not found
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$draw_layer(...)
 16. │             └─ggplot2 (local) draw_layer(..., self = self)
 17. │               └─base::lapply(...)
 18. │                 └─ggplot2 (local) FUN(X[[i]], ...)
 19. │                   ├─rlang::inject(self$draw_panel(data, panel_params, coord, !!!params))
 20. │                   └─self$draw_panel(data, panel_params, coord, minimal = FALSE, year_lim = NULL)
 21. │                     └─chronochrt (local) draw_panel(...)
 22. └─base::.handleSimpleError(...)
 23.   └─rlang (local) h(simpleError(msg, call))
 24.     └─handlers[[1L]](cnd)
 25.       └─cli::cli_abort(...)
 26.         └─rlang::abort(...)
Execution halted