Package check result: ERROR

Check: examples, Result: ERROR
  Running examples in ‘zoomerjoin-Ex.R’ failed
  The error most likely occurred in:
  
  > base::assign(".ptime", proc.time(), pos = "CheckExEnv")
  > ### Name: jaccard_string_group
  > ### Title: Fuzzy String Grouping Using Minhashing
  > ### Aliases: jaccard_string_group
  > 
  > ### ** Examples
  > 
  > 
  > string <- c(
  +   "beniamino", "jack", "benjamin", "beniamin",
  +   "jacky", "giacomo", "gaicomo"
  + )
  > jaccard_string_group(string, threshold = .2, n_bands = 90, n_gram_width = 1)
  Loading required namespace: igraph
  Failed with error:  ‘there is no package called ‘igraph’’
  Error in jaccard_string_group(string, threshold = 0.2, n_bands = 90, n_gram_width = 1) : 
    library 'igraph' must be installed to run this function
  Execution halted