Error(s) in re-building vignettes:
  ...
--- re-building ‘constraints.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Loading required package: OpenMx
To take full advantage of multiple cores, use:
  mxOption(key='Number of Threads', value=parallel::detectCores()) #now
  Sys.setenv(OMP_NUM_THREADS=parallel::detectCores()) #before library(OpenMx)
Error: C stack usage  315135124 is too close to the limit
Quitting from lines 101-105 (constraints.Rmd) 
Error: processing vignette 'constraints.Rmd' failed with diagnostics:
The job for model 'CFA' exited abnormally with the error message: User interrupt
--- failed re-building ‘constraints.Rmd’

--- re-building ‘forests.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Error: C stack usage  315659412 is too close to the limit
Quitting from lines 40-53 (forests.Rmd) 
Error: processing vignette 'forests.Rmd' failed with diagnostics:
The job for model 'Simple Model' exited abnormally with the error message: User interrupt
--- failed re-building ‘forests.Rmd’

--- re-building ‘getting-started.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Error: C stack usage  315135124 is too close to the limit
Quitting from lines 110-111 (getting-started.Rmd) 
Error: processing vignette 'getting-started.Rmd' failed with diagnostics:
non-numeric argument to mathematical function
--- failed re-building ‘getting-started.Rmd’

--- re-building ‘score-based-tests.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Error: C stack usage  314872980 is too close to the limit
Quitting from lines 44-58 (score-based-tests.Rmd) 
Error: processing vignette 'score-based-tests.Rmd' failed with diagnostics:
The job for model 'Simple Model' exited abnormally with the error message: User interrupt
--- failed re-building ‘score-based-tests.Rmd’

--- re-building ‘semforest-focus.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Error: C stack usage  250713236 is too close to the limit
Quitting from lines 29-61 (semforest-focus.Rmd) 
Error: processing vignette 'semforest-focus.Rmd' failed with diagnostics:
The job for model 'Bivariate_Model' exited abnormally with the error message: User interrupt
--- failed re-building ‘semforest-focus.Rmd’

SUMMARY: processing the following files failed:
  ‘constraints.Rmd’ ‘forests.Rmd’ ‘getting-started.Rmd’
  ‘score-based-tests.Rmd’ ‘semforest-focus.Rmd’

Error: Vignette re-building failed.
Execution halted