Error(s) in re-building vignettes:
--- re-building ‘epiR_RSurveillance.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 ‘epiR_RSurveillance.Rmd’

--- re-building ‘epiR_descriptive.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Loading required package: survival
Package epiR 2.0.31 is loaded
Type help(epi.about) for summary information
Type browseVignettes(package = 'epiR') to learn how to use epiR for applied epidemiological analyses



Attaching package: 'lubridate'

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

    date, intersect, setdiff, union

Quitting from lines 87-94 (epiR_descriptive.Rmd) 
Error: processing vignette 'epiR_descriptive.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘epiR_descriptive.Rmd’

--- re-building ‘epiR_measures_of_association.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 197-223 (epiR_measures_of_association.Rmd) 
Error: processing vignette 'epiR_measures_of_association.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘epiR_measures_of_association.Rmd’

--- re-building ‘epiR_sample_size.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Loading required package: survival
Package epiR 2.0.31 is loaded
Type help(epi.about) for summary information
Type browseVignettes(package = 'epiR') to learn how to use epiR for applied epidemiological analyses


--- finished re-building ‘epiR_sample_size.Rmd’

--- re-building ‘epiR_surveillance.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Loading required package: survival
Package epiR 2.0.31 is loaded
Type help(epi.about) for summary information
Type browseVignettes(package = 'epiR') to learn how to use epiR for applied epidemiological analyses



Attaching package: 'lubridate'

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

    date, intersect, setdiff, union

Quitting from lines 263-289 (epiR_surveillance.Rmd) 
Error: processing vignette 'epiR_surveillance.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘epiR_surveillance.Rmd’

SUMMARY: processing the following files failed:
  ‘epiR_descriptive.Rmd’ ‘epiR_measures_of_association.Rmd’
  ‘epiR_surveillance.Rmd’

Error: Vignette re-building failed.
Execution halted