Error(s) in re-building vignettes:
--- re-building ‘CDISC_ADaM.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Quitting from lines 85-87 (CDISC_ADaM.Rmd) 
Error: processing vignette 'CDISC_ADaM.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘CDISC_ADaM.Rmd’

--- re-building ‘Consort_flow_diagram.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
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--- finished re-building ‘Consort_flow_diagram.Rmd’

--- re-building ‘Styling_KM_plots.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Quitting from lines 56-59 (Styling_KM_plots.Rmd) 
Error: processing vignette 'Styling_KM_plots.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘Styling_KM_plots.Rmd’

--- re-building ‘Time_to_event_analysis.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Quitting from lines 180-183 (Time_to_event_analysis.Rmd) 
Error: processing vignette 'Time_to_event_analysis.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘Time_to_event_analysis.Rmd’

SUMMARY: processing the following files failed:
  ‘CDISC_ADaM.Rmd’ ‘Styling_KM_plots.Rmd’ ‘Time_to_event_analysis.Rmd’

Error: Vignette re-building failed.
Execution halted