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: mockOmopSketch
  > ### Title: Creates a mock database to test OmopSketch package.
  > ### Aliases: mockOmopSketch
  > 
  > ### ** Examples
  > 
  > mockOmopSketch(numberIndividuals = 100)
  Error in mockOmopSketch(numberIndividuals = 100) : 
    The package "duckdb" is required.
  Calls: mockOmopSketch -> <Anonymous>
  Execution halted

Check: re-building of vignette outputs, Result: ERROR
  Error(s) in re-building vignettes:
    ...
  --- re-building ‘A-summarise_clinical_tables_records.Rmd’ using rmarkdown
  
  Quitting from lines 36-41 [unnamed-chunk-2] (A-summarise_clinical_tables_records.Rmd)
  Error: processing vignette 'A-summarise_clinical_tables_records.Rmd' failed with diagnostics:
  The package "duckdb" is required.
  --- failed re-building ‘A-summarise_clinical_tables_records.Rmd’
  
  --- re-building ‘B-summarise_concept_counts.Rmd’ using rmarkdown
  trying URL 'https://example-data.ohdsi.dev/GiBleed.zip'
  Content type 'application/zip' length 6754786 bytes (6.4 MB)
  ==================================================
  downloaded 6.4 MB
  
  
  Quitting from lines 37-51 [unnamed-chunk-2] (B-summarise_concept_counts.Rmd)
  Error: processing vignette 'B-summarise_concept_counts.Rmd' failed with diagnostics:
  there is no package called 'duckdb'
  --- failed re-building ‘B-summarise_concept_counts.Rmd’
  
  --- re-building ‘C-summarise_pop_characteristics.Rmd’ using rmarkdown
  trying URL 'https://example-data.ohdsi.dev/GiBleed.zip'
  Content type 'application/zip' length 6754786 bytes (6.4 MB)
  ==================================================
  downloaded 6.4 MB
  
  
  Quitting from lines 37-50 [unnamed-chunk-2] (C-summarise_pop_characteristics.Rmd)
  Error: processing vignette 'C-summarise_pop_characteristics.Rmd' failed with diagnostics:
  there is no package called 'duckdb'
  --- failed re-building ‘C-summarise_pop_characteristics.Rmd’
  
  SUMMARY: processing the following files failed:
    ‘A-summarise_clinical_tables_records.Rmd’
    ‘B-summarise_concept_counts.Rmd’
    ‘C-summarise_pop_characteristics.Rmd’
  
  Error: Vignette re-building failed.
  Execution halted