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

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

--- re-building ‘three-level.Rmd’ using rmarkdown
Scale for 'x' is already present. Adding another scale for 'x', 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 'three-level.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘three-level.Rmd’

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

SUMMARY: processing the following files failed:
  ‘simulations.Rmd’ ‘technical.Rmd’ ‘three-level.Rmd’ ‘two-level.Rmd’

Error: Vignette re-building failed.
Execution halted