Error(s) in re-building vignettes:
--- re-building ‘cycling-potential-uk.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 ‘cycling-potential-uk.Rmd’

--- re-building ‘km-cycled.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Linking to GEOS 3.8.1, GDAL 3.2.1, PROJ 7.2.1
although coordinates are longitude/latitude, st_intersects assumes that they are planar
Warning in st_centroid.sf(rnet) :
  st_centroid assumes attributes are constant over geometries of x
Warning in st_centroid.sfc(st_geometry(x), of_largest_polygon = of_largest_polygon) :
  st_centroid does not give correct centroids for longitude/latitude data
although coordinates are longitude/latitude, st_intersects assumes that they are planar
tmap mode set to plotting
Warning in st_centroid.sf(rnet) :
  st_centroid assumes attributes are constant over geometries of x
Warning in st_centroid.sfc(st_geometry(x), of_largest_polygon = of_largest_polygon) :
  st_centroid does not give correct centroids for longitude/latitude data
although coordinates are longitude/latitude, st_intersects assumes that they are planar
tmap mode set to plotting
Warning in st_centroid.sf(rnet) :
  st_centroid assumes attributes are constant over geometries of x
Warning in st_centroid.sfc(st_geometry(x), of_largest_polygon = of_largest_polygon) :
  st_centroid does not give correct centroids for longitude/latitude data
although coordinates are longitude/latitude, st_intersects assumes that they are planar
tmap mode set to plotting
Warning in st_centroid.sf(rnet) :
  st_centroid assumes attributes are constant over geometries of x
Warning in st_centroid.sfc(st_geometry(x), of_largest_polygon = of_largest_polygon) :
  st_centroid does not give correct centroids for longitude/latitude data
although coordinates are longitude/latitude, st_intersects assumes that they are planar
tmap mode set to plotting
Warning in st_centroid.sf(rnet) :
  st_centroid assumes attributes are constant over geometries of x
Warning in st_centroid.sfc(st_geometry(x), of_largest_polygon = of_largest_polygon) :
  st_centroid does not give correct centroids for longitude/latitude data
although coordinates are longitude/latitude, st_intersects assumes that they are planar
tmap mode set to plotting
Warning in st_centroid.sf(rnet) :
  st_centroid assumes attributes are constant over geometries of x
Warning in st_centroid.sfc(st_geometry(x), of_largest_polygon = of_largest_polygon) :
  st_centroid does not give correct centroids for longitude/latitude data
although coordinates are longitude/latitude, st_intersects assumes that they are planar
tmap mode set to plotting
--- finished re-building ‘km-cycled.Rmd’

--- re-building ‘pct-international.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 109-116 (pct-international.Rmd) 
Error: processing vignette 'pct-international.Rmd' failed with diagnostics:
invalid 'path' argument
--- failed re-building ‘pct-international.Rmd’

--- re-building ‘pct.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Linking to GEOS 3.8.1, GDAL 3.2.1, PROJ 7.2.1

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 169-175 (pct.Rmd) 
Error: processing vignette 'pct.Rmd' failed with diagnostics:
invalid 'path' argument
--- failed re-building ‘pct.Rmd’

--- re-building ‘pct_training.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 276-280 (pct_training.Rmd) 
Error: processing vignette 'pct_training.Rmd' failed with diagnostics:
invalid 'path' argument
--- failed re-building ‘pct_training.Rmd’

--- re-building ‘uk-cities.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

Linking to GEOS 3.8.1, GDAL 3.2.1, PROJ 7.2.1
--- finished re-building ‘uk-cities.Rmd’

SUMMARY: processing the following files failed:
  ‘pct-international.Rmd’ ‘pct.Rmd’ ‘pct_training.Rmd’

Error: Vignette re-building failed.
Execution halted