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 2.0.19 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

To access larger datasets in this package, install the spDataLarge
package with: `install.packages('spDataLarge',
repos='https://nowosad.github.io/drat/', type='source')`
Loading required package: sp
rgeos version: 0.5-5, (SVN revision 640)
 GEOS runtime version: 3.9.1-CAPI-1.14.2 
 Linking to sp version: 1.4-5 
 Polygon checking: TRUE 

Quitting from lines 266-271 (epiR_descriptive.Rmd) 
Error: processing vignette 'epiR_descriptive.Rmd' failed with diagnostics:
there is no package called 'rgdal'
--- failed re-building ‘epiR_descriptive.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 2.0.19 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 2.0.19 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

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

SUMMARY: processing the following file failed:
  ‘epiR_descriptive.Rmd’

Error: Vignette re-building failed.
Execution halted