Error(s) in re-building vignettes:
--- re-building ‘a_1_getting_started.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 'a_1_getting_started.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘a_1_getting_started.Rmd’

--- re-building ‘a_2_mlrCPO_core.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 'a_2_mlrCPO_core.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘a_2_mlrCPO_core.Rmd’

--- re-building ‘a_3_all_CPOs.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 'a_3_all_CPOs.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘a_3_all_CPOs.Rmd’

--- re-building ‘a_4_custom_CPOs.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 'a_4_custom_CPOs.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘a_4_custom_CPOs.Rmd’

--- re-building ‘z_1_getting_started_terse.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 'z_1_getting_started_terse.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘z_1_getting_started_terse.Rmd’

--- re-building ‘z_2_mlrCPO_core_terse.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 'z_2_mlrCPO_core_terse.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘z_2_mlrCPO_core_terse.Rmd’

--- re-building ‘z_3_all_CPOs_terse.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 'z_3_all_CPOs_terse.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘z_3_all_CPOs_terse.Rmd’

--- re-building ‘z_4_custom_CPOs_terse.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 'z_4_custom_CPOs_terse.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘z_4_custom_CPOs_terse.Rmd’

SUMMARY: processing the following files failed:
  ‘a_1_getting_started.Rmd’ ‘a_2_mlrCPO_core.Rmd’ ‘a_3_all_CPOs.Rmd’
  ‘a_4_custom_CPOs.Rmd’ ‘z_1_getting_started_terse.Rmd’
  ‘z_2_mlrCPO_core_terse.Rmd’ ‘z_3_all_CPOs_terse.Rmd’
  ‘z_4_custom_CPOs_terse.Rmd’

Error: Vignette re-building failed.
Execution halted