Error(s) in re-building vignettes:
--- re-building ‘cycling-potential-uk.Rmd’ using rmarkdown
Linking to GEOS 3.7.2, GDAL 2.4.2, PROJ 5.2.0

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

Warning: replacing previous import 'sf::st_make_valid' by 'lwgeom::st_make_valid' when loading 'tmap'
dyld: lazy symbol binding failed: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

dyld: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

Error: processing vignette 'cycling-potential-uk.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘cycling-potential-uk.Rmd’

--- re-building ‘pct-international.Rmd’ using rmarkdown
dyld: lazy symbol binding failed: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

dyld: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

Error: processing vignette 'pct-international.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘pct-international.Rmd’

--- re-building ‘pct.Rmd’ using rmarkdown
dyld: lazy symbol binding failed: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

dyld: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

Error: processing vignette 'pct.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘pct.Rmd’

--- re-building ‘pct_training.Rmd’ using rmarkdown

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

tmap mode set to interactive viewing
Linking to GEOS 3.7.2, GDAL 2.4.2, PROJ 5.2.0
Legend for line widths not available in view mode.
Warning in plot.sf(l_top_cycling, add = TRUE, lwd = 5, col = "green") :
  ignoring all but the first attribute
Warning in plot.sf(l_top_driving, add = TRUE, lwd = 5, col = "red") :
  ignoring all but the first attribute
Warning in plot.sf(l_top_cycling, add = TRUE, lwd = 5, col = "green") :
  ignoring all but the first attribute
Warning in plot.sf(l_top_driving, add = TRUE, lwd = 5, col = "red") :
  ignoring all but the first attribute
Warning in plot.sf(l_top_cycling, add = TRUE, lwd = l_top_cycling$bicycle/mean(l_top_cycling$bicycle),  :
  ignoring all but the first attribute
Warning in plot.sf(l_top_driving, add = TRUE, lwd = l_top_driving$car_driver/mean(l_top_driving$car_driver),  :
  ignoring all but the first attribute
2020-04-02 08:34:08 constructing segments
2020-04-02 08:34:08 building geometry
2020-04-02 08:34:08 simplifying geometry
2020-04-02 08:34:08 aggregating flows
2020-04-02 08:34:09 rejoining segments into linestrings
Legend for line widths not available in view mode.
dyld: lazy symbol binding failed: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

dyld: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

Error: processing vignette 'pct_training.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘pct_training.Rmd’

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

Error: Vignette re-building failed.
Execution halted