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

Attaching package: 'dplyr'

The following objects are masked from 'package:stats':

    filter, lag

The following objects are masked from 'package:base':

    intersect, setdiff, setequal, union

Quitting from lines 50-56 (LOS_model.Rmd) 
Error: processing vignette 'LOS_model.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘LOS_model.Rmd’

--- re-building ‘ae_attendances.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 94-102 (ae_attendances.Rmd) 
Error: processing vignette 'ae_attendances.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘ae_attendances.Rmd’

--- re-building ‘ons_mortality.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 ‘ons_mortality.Rmd’

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

Attaching package: 'dplyr'

The following objects are masked from 'package:stats':

    filter, lag

The following objects are masked from 'package:base':

    intersect, setdiff, setequal, union

Loading required package: lattice
--- finished re-building ‘stranded_model.Rmd’

--- re-building ‘synthetic_news_data.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 75-96 (synthetic_news_data.Rmd) 
Error: processing vignette 'synthetic_news_data.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘synthetic_news_data.Rmd’

SUMMARY: processing the following files failed:
  ‘LOS_model.Rmd’ ‘ae_attendances.Rmd’ ‘synthetic_news_data.Rmd’

Error: Vignette re-building failed.
Execution halted