Error(s) in re-building vignettes:
--- re-building ‘Part_1_Introduction.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 'Part_1_Introduction.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘Part_1_Introduction.Rmd’

--- re-building ‘Part_2_Transition_Densities.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 'Part_2_Transition_Densities.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘Part_2_Transition_Densities.Rmd’

--- re-building ‘Part_3_Bivariate_Diffusions.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 'Part_3_Bivariate_Diffusions.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘Part_3_Bivariate_Diffusions.Rmd’

--- re-building ‘DiffusionRjgqd_Paper.pdf.asis’ using asis
--- finished re-building ‘DiffusionRjgqd_Paper.pdf.asis’

--- re-building ‘DiffusionRjgqd_RepMaterials.html.asis’ using asis
--- finished re-building ‘DiffusionRjgqd_RepMaterials.html.asis’

--- re-building ‘Part_4_Likelihood_Inference.html.asis’ using asis
--- finished re-building ‘Part_4_Likelihood_Inference.html.asis’

SUMMARY: processing the following files failed:
  ‘Part_1_Introduction.Rmd’ ‘Part_2_Transition_Densities.Rmd’
  ‘Part_3_Bivariate_Diffusions.Rmd’

Error: Vignette re-building failed.
Execution halted