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

--- re-building ‘NKDE.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Checking rgeos availability: TRUE
rgeos version: 0.5-5, (SVN revision 640)
 GEOS runtime version: 3.6.4-CAPI-1.10.4 
 Linking to sp version: 1.4-4 
 Polygon checking: TRUE 


Attaching package: 'dplyr'

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

    intersect, select, union

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

    intersect, setdiff, union

The following object is masked from 'package:kableExtra':

    group_rows

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

    filter, lag

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

    intersect, setdiff, setequal, union

Warning: Removed 6566 row(s) containing missing values (geom_path).
Warning: Removed 3255 rows containing missing values (geom_point).
--- finished re-building ‘NKDE.Rmd’

--- re-building ‘NKDEdetailed.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Loading required package: sp
rgeos version: 0.5-5, (SVN revision 640)
 GEOS runtime version: 3.6.4-CAPI-1.10.4 
 Linking to sp version: 1.4-4 
 Polygon checking: TRUE 

Checking rgeos availability: TRUE
Quitting from lines 40-84 (NKDEdetailed.Rmd) 
Error: processing vignette 'NKDEdetailed.Rmd' failed with diagnostics:
no arguments in initialization list
--- failed re-building ‘NKDEdetailed.Rmd’

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

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

Error: Vignette re-building failed.
Execution halted