Error(s) in re-building vignettes:
--- re-building ‘adaptation_level.Rmd’ using rmarkdown
Loading required package: Rcpp

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

Scale for 'x' is already present. Adding another scale for 'x', which will replace the existing scale.
Scale for 'y' is already present. Adding another scale for 'y', which will replace the existing scale.
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 'adaptation_level.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘adaptation_level.Rmd’

--- re-building ‘afterimages.Rmd’ using rmarkdown
Loading required package: Rcpp

********************************************************
Note: As of version 1.0.0, cowplot does not change the
  default ggplot2 theme anymore. To recover the previous
  behavior, execute:
  theme_set(theme_cowplot())
********************************************************


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

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 'afterimages.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘afterimages.Rmd’

--- re-building ‘flanker.Rmd’ using rmarkdown
Loading required package: Rcpp

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 in y1 - y2 :
  longer object length is not a multiple of shorter object length
Warning in y1 - y2 :
  longer object length is not a multiple of shorter object length
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 'flanker.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘flanker.Rmd’

--- re-building ‘stroop.Rmd’ using rmarkdown
Loading required package: Rcpp
Scale for 'fill' is already present. Adding another scale for 'fill', which will replace the existing scale.
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 'stroop.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘stroop.Rmd’

SUMMARY: processing the following files failed:
  ‘adaptation_level.Rmd’ ‘afterimages.Rmd’ ‘flanker.Rmd’ ‘stroop.Rmd’

Error: Vignette re-building failed.
Execution halted