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

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

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

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

SUMMARY: processing the following files failed:
  ‘ExPanD_notebook.Rmd’ ‘ExPanDaR-functions.Rmd’ ‘customize_ExPanD.Rmd’
  ‘use_ExPanD.Rmd’

Error: Vignette re-building failed.
Execution halted