Error(s) in re-building vignettes:
  ...
--- re-building ‘stplanr-od.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.

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 213-217 (stplanr-od.Rmd) 
Error: processing vignette 'stplanr-od.Rmd' failed with diagnostics:
there is no package called 'webshot'
--- failed re-building ‘stplanr-od.Rmd’

--- re-building ‘stplanr-paper.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.
Parsed with column specification:
cols(
  Function = col_character(),
  `Input data type(s)` = col_character(),
  `Output data type` = col_character()
)
Transforming to CRS +proj=aeqd +lat_0=53.81840897 +lon_0=-1.52833461 +x_0=0 +y_0=0 +ellps=WGS84
Warning in igraph::get.shortest.paths(sln@g, x, output = "epath") :
  At structural_properties.c:4597 :Couldn't reach some vertices
Warning in igraph::get.shortest.paths(sln@g, x, output = "epath") :
  At structural_properties.c:4597 :Couldn't reach some vertices
Warning in igraph::get.shortest.paths(sln@g, x, output = "epath") :
  At structural_properties.c:4597 :Couldn't reach some vertices
Warning in igraph::get.shortest.paths(sln@g, x, output = "epath") :
  At structural_properties.c:4597 :Couldn't reach some vertices
Warning in igraph::get.shortest.paths(sln@g, x, output = "epath") :
  At structural_properties.c:4597 :Couldn't reach some vertices
Warning in igraph::get.shortest.paths(sln@g, x, output = "epath") :
  At structural_properties.c:4597 :Couldn't reach some vertices
Warning in igraph::get.shortest.paths(sln@g, x, output = "epath") :
  At structural_properties.c:4597 :Couldn't reach some vertices
Warning in igraph::get.shortest.paths(sln@g, x, output = "epath") :
  At structural_properties.c:4597 :Couldn't reach some vertices
Warning in igraph::get.shortest.paths(sln@g, x, output = "epath") :
  At structural_properties.c:4597 :Couldn't reach some vertices
Warning in igraph::get.shortest.paths(sln@g, x, output = "epath") :
  At structural_properties.c:4597 :Couldn't reach some vertices
Warning in igraph::get.shortest.paths(sln@g, x, output = "epath") :
  At structural_properties.c:4597 :Couldn't reach some vertices
Transforming to CRS +proj=aeqd +lat_0=53.81907246 +lon_0=-1.52841182 +x_0=0 +y_0=0 +ellps=WGS84
--- finished re-building ‘stplanr-paper.Rmd’

--- re-building ‘stplanr-route-nets.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.
2019-11-07 16:43:36 constructing segments
2019-11-07 16:43:36 building geometry
2019-11-07 16:43:36 simplifying geometry
2019-11-07 16:43:36 aggregating flows
2019-11-07 16:43:36 rejoining segments into linestrings
--- finished re-building ‘stplanr-route-nets.Rmd’

--- re-building ‘stplanr-routing.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 ‘stplanr-routing.Rmd’

--- re-building ‘stplanr.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 ‘stplanr.Rmd’

SUMMARY: processing the following file failed:
  ‘stplanr-od.Rmd’

Error: Vignette re-building failed.
Execution halted