Package check result: ERROR

Check: examples, Result: ERROR
  Running examples in ‘mlr3fairness-Ex.R’ failed
  The error most likely occurred in:
  
  > base::assign(".ptime", proc.time(), pos = "CheckExEnv")
  > ### Name: report_datasheet
  > ### Title: Create a Datasheet for Documenting a Dataset
  > ### Aliases: report_datasheet
  > 
  > ### ** Examples
  > 
  >   report_file = tempfile()
  >   report_datasheet(report_file)
  Error in loadNamespace(x) : there is no package called ‘rmarkdown’
  Calls: report_datasheet ... loadNamespace -> withRestarts -> withOneRestart -> doWithOneRestart
  Execution halted