Error(s) in re-building vignettes:
--- re-building ‘constraints.Rmd’ using rmarkdown
Loading required package: OpenMx
OpenMx may run faster if it is compiled to take advantage of multiple cores.
Warning: code chunks must not depend on the uncached chunk "difsim"
No Invariance alpha selected. alpha.invariance set to:0.05
Warning: In model 'sharedModel' Optimizer returned a non-zero status code 6. The model does not satisfy the first-order optimality conditions to the required accuracy, and no improved point for the merit function could be found during the final linesearch (Mx status RED)
Warning: In model 'sharedModel' Optimizer returned a non-zero status code 6. The model does not satisfy the first-order optimality conditions to the required accuracy, and no improved point for the merit function could be found during the final linesearch (Mx status RED)
Warning: In model 'sharedModel' Optimizer returned a non-zero status code 6. The model does not satisfy the first-order optimality conditions to the required accuracy, and no improved point for the merit function could be found during the final linesearch (Mx status RED)
Warning: In model 'sharedModel' Optimizer returned a non-zero status code 6. The model does not satisfy the first-order optimality conditions to the required accuracy, and no improved point for the merit function could be found during the final linesearch (Mx status RED)
Loading required package: ggplot2
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 'constraints.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘constraints.Rmd’

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

SUMMARY: processing the following files failed:
  ‘constraints.Rmd’ ‘getting-started.Rmd’

Error: Vignette re-building failed.
Execution halted