Error(s) in re-building vignettes:
--- re-building ‘dominance.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 'dominance.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘dominance.Rmd’

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

--- re-building ‘introduction.Rmd’ using rmarkdown
Loading required package: nlme
This is mgcv 1.8-31. For overview type 'help("mgcv-package")'.
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 'introduction.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘introduction.Rmd’

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

SUMMARY: processing the following files failed:
  ‘dominance.Rmd’ ‘heterogeneity.Rmd’ ‘introduction.Rmd’
  ‘multivariate.Rmd’

Error: Vignette re-building failed.
Execution halted