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

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

--- re-building ‘the-imagej-problem.Rmd’ using rmarkdown
Reading Rlogo-banana-red_green.tif: an 8-bit, 155x200 pixel
image of unsigned integer type. Reading 2 channels and 3
frames . . .
 Done.
Warning in .local(object, ...) :
  frame 3 cannot be normalized as its diff(range) is 0
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 'the-imagej-problem.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘the-imagej-problem.Rmd’

SUMMARY: processing the following files failed:
  ‘reading-and-writing-images.Rmd’ ‘text-images.Rmd’
  ‘the-imagej-problem.Rmd’

Error: Vignette re-building failed.
Execution halted