Package check result: ERROR

Check: examples, Result: ERROR
  Running examples in ‘IOHanalyzer-Ex.R’ failed
  The error most likely occurred in:
  
  > base::assign(".ptime", proc.time(), pos = "CheckExEnv")
  > ### Name: Plot.Stats.Glicko2_Candlestick
  > ### Title: Create a candlestick plot of Glicko2-rankings
  > ### Aliases: Plot.Stats.Glicko2_Candlestick
  > ###   Plot.Stats.Glicko2_Candlestick.DataSetList
  > 
  > ### ** Examples
  > 
  > Plot.Stats.Glicko2_Candlestick(dsl, nr_rounds=2)
  Error: Package "PlayerRatings" is needed for this function to work. Please install it.
  Execution halted

Check: tests, Result: ERROR
    Running ‘testthat.R’ [3s/3s]
  Running the tests in ‘tests/testthat.R’ failed.
  Complete output:
    > library(testthat)
    > library(IOHanalyzer)
    > library(data.table)
    > 
    > threads <- getDTthreads()
    > setDTthreads(1)
    > test_check("IOHanalyzer")
    Processing /home/hornik/tmp/CRAN_special_noSuggests/IOHanalyzer.Rcheck/IOHanalyzer/extdata/ONE_PLUS_LAMDA_EA/IOHprofiler_f1_i1.info ...
       algorithm ONE_PLUS_LAMDA_EA...
          10 instances on f1 100D...
    
    Processing /home/hornik/tmp/CRAN_special_noSuggests/IOHanalyzer.Rcheck/IOHanalyzer/extdata/ONE_PLUS_LAMDA_EA_ws/IOHprofiler_fbla_i1.info ...
       algorithm ONE_PLUS_LAMDA_EA...
          10 instances on fbla 100D...
    
    Processing /home/hornik/tmp/CRAN_special_noSuggests/IOHanalyzer.Rcheck/IOHanalyzer/extdata/ONE_PLUS_LAMDA_EA_ws/IOHprofiler_fblubb_i1.info ...
       algorithm ONE_PLUS_LAMDA_EA...
          10 instances on fblubb 100D...
    
    Processing /home/hornik/tmp/CRAN_special_noSuggests/IOHanalyzer.Rcheck/IOHanalyzer/extdata/ONE_PLUS_LAMDA_EA_ws/IOHprofiler_fbla_i1.info ...
       algorithm ONE_PLUS_LAMDA_EA...
          10 instances on fbla 100D...
    
    Processing /home/hornik/tmp/CRAN_special_noSuggests/IOHanalyzer.Rcheck/IOHanalyzer/extdata/ONE_PLUS_LAMDA_EA_ws/IOHprofiler_fblubb_i1.info ...
       algorithm ONE_PLUS_LAMDA_EA...
          10 instances on fblubb 100D...
    
    Processing /home/hornik/tmp/CRAN_special_noSuggests/IOHanalyzer.Rcheck/IOHanalyzer/extdata/ONE_PLUS_LAMDA_EA/IOHprofiler_f1_i1.info ...
       algorithm ONE_PLUS_LAMDA_EA...
          10 instances on f1 100D...
    
    Processing /home/hornik/tmp/CRAN_special_noSuggests/IOHanalyzer.Rcheck/IOHanalyzer/extdata/ONE_PLUS_LAMDA_EA_ws/IOHprofiler_fbla_i1.info ...
       algorithm ONE_PLUS_LAMDA_EA...
          10 instances on fbla 100D...
    
    Processing /home/hornik/tmp/CRAN_special_noSuggests/IOHanalyzer.Rcheck/IOHanalyzer/extdata/ONE_PLUS_LAMDA_EA_ws/IOHprofiler_fblubb_i1.info ...
       algorithm ONE_PLUS_LAMDA_EA...
          10 instances on fblubb 100D...
    
    [ FAIL 1 | WARN 0 | SKIP 0 | PASS 117 ]
    
    ══ Failed tests ════════════════════════════════════════════════════════════════
    ── Error ('test_diagram_examples_with_string_names.R:33:3'): Test the diagram examples with string names ──
    Error: Package "igraph" needed for this function to work. Please install it.
    Backtrace:
        ▆
     1. ├─IOHanalyzer::Plot.Stats.Significance_Graph(...) at test_diagram_examples_with_string_names.R:33:3
     2. └─IOHanalyzer:::Plot.Stats.Significance_Graph.DataSetList(...)
    
    [ FAIL 1 | WARN 0 | SKIP 0 | PASS 117 ]
    Error: Test failures
    Execution halted