Package check result: ERROR

Check: examples, Result: ERROR
  Running examples in ‘manynet-Ex.R’ failed
  The error most likely occurred in:
  
  > base::assign(".ptime", proc.time(), pos = "CheckExEnv")
  > ### Name: map_graphr
  > ### Title: Easily graph networks with sensible defaults
  > ### Aliases: map_graphr graphr
  > 
  > ### ** Examples
  > 
  > graphr(ison_adolescents)
  > ison_adolescents %>%
  +   mutate(color = rep(c("extrovert", "introvert"), times = 4),
  +          size = ifelse(node_is_cutpoint(ison_adolescents), 6, 3)) %>%
  +   mutate_ties(ecolor = rep(c("friends", "acquaintances"), times = 5)) %>%
  +   graphr(node_color = "color", node_size = "size",
  +          edge_size = 1.5, edge_color = "ecolor")
  > graphr(ison_lotr, node_color = Race, node_size = node_degree(ison_lotr)*2,
  +        edge_color = "yellow", edge_size = tie_degree(ison_lotr))
  > graphr(ison_karateka, node_group = allegiance,
  +        edge_size = tie_closeness(ison_karateka))
  Error in ggforce::geom_mark_hull(ggplot2::aes(x, y, fill = node_group,  : 
    The package "concaveman" is required to calculate concave hulls
  Calls: graphr -> .graph_layout -> <Anonymous> -> check_installed
  Execution halted
  Examples with CPU (user + system) or elapsed time > 5s
              user system elapsed
  make_play 22.737  3.102  26.186