Error(s) in re-building vignettes:
--- re-building ‘Analysis.Rmd’ using rmarkdown
*** This is beta software. Please report any bugs!
*** See the NEWS file for recent changes.
Loading required package: Matrix
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 'Analysis.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘Analysis.Rmd’

--- re-building ‘Introduction.Rmd’ using rmarkdown
*** This is beta software. Please report any bugs!
*** See the NEWS file for recent changes.
Loading required package: Matrix
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 ‘Level2.Rmd’ using rmarkdown
*** This is beta software. Please report any bugs!
*** See the NEWS file for recent changes.
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 'Level2.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘Level2.Rmd’

SUMMARY: processing the following files failed:
  ‘Analysis.Rmd’ ‘Introduction.Rmd’ ‘Level2.Rmd’

Error: Vignette re-building failed.
Execution halted