Error(s) in re-building vignettes:
--- re-building ‘Frank2018.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 133-150 (Frank2018.Rmd) 
Error: processing vignette 'Frank2018.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘Frank2018.Rmd’

--- re-building ‘Honda2019.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 90-99 (Honda2019.Rmd) 
Error: processing vignette 'Honda2019.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘Honda2019.Rmd’

--- re-building ‘Linakis2020.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 691-753 (Linakis2020.Rmd) 
Error: processing vignette 'Linakis2020.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘Linakis2020.Rmd’

--- re-building ‘Ring_2017_vignette06_aerplotting.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
--- finished re-building ‘Ring_2017_vignette06_aerplotting.Rmd’

--- re-building ‘Wambaugh2018.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 662-757 (Wambaugh2018.Rmd) 
Error: processing vignette 'Wambaugh2018.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘Wambaugh2018.Rmd’

--- re-building ‘Wambaugh2019.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 426-515 (Wambaugh2019.Rmd) 
Error: processing vignette 'Wambaugh2019.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘Wambaugh2019.Rmd’

SUMMARY: processing the following files failed:
  ‘Frank2018.Rmd’ ‘Honda2019.Rmd’ ‘Linakis2020.Rmd’ ‘Wambaugh2018.Rmd’
  ‘Wambaugh2019.Rmd’

Error: Vignette re-building failed.
Execution halted