Package check result: ERROR

Check: examples, Result: ERROR
  Running examples in ‘OmopSketch-Ex.R’ failed
  The error most likely occurred in:
  
  > base::assign(".ptime", proc.time(), pos = "CheckExEnv")
  > ### Name: summariseOmopSnapshot
  > ### Title: Summarise a cdm_reference object creating a snapshot with the
  > ###   metadata of the cdm_reference object.
  > ### Aliases: summariseOmopSnapshot
  > 
  > ### ** Examples
  > 
  > cdm <- mockOmopSketch(numberIndividuals = 10)
  Error in mockOmopSketch(numberIndividuals = 10) : 
    The package "duckdb" is required.
  Calls: mockOmopSketch -> <Anonymous>
  Execution halted