Error(s) in re-building vignettes:
--- re-building ‘PhenotypeSimulator.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
--- finished re-building ‘PhenotypeSimulator.Rmd’

--- re-building ‘Sample-scripts-external-genotype-simulation.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Error: processing vignette 'Sample-scripts-external-genotype-simulation.Rmd' failed with diagnostics:
Failed to locate ‘weave’ output file ‘Sample-scripts-external-genotype-simulation.pdf’ or ‘Sample-scripts-external-genotype-simulation.html’ for vignette with name ‘Sample-scripts-external-genotype-simulation’ and engine ‘knitr::rmarkdown’. The following files exist in working directory ‘/Volumes/Builds/packages/high-sierra-x86_64/results/4.0/PhenotypeSimulator.Rcheck/vign_test/PhenotypeSimulator/vignettes’: ‘PhenotypeSimulator.R’ (18561 bytes), ‘PhenotypeSimulator.Rmd’ (30753 bytes), ‘PhenotypeSimulator.html’ (266386 bytes), ‘PhenotypeSimulator.md’ (31815 bytes), ‘Sample-scripts-external-genotype-simulation.R’ (152 bytes), ‘Sample-scripts-external-genotype-simulation.Rmd’ (5727 bytes), ‘Sample-scripts-external-genotype-simulation.md’ (5574 bytes), ‘Simulation-and-LinearModel.Rmd’ (31116 bytes), ‘SimulationAndLinearModel.bib’ (5567 bytes), ‘SimulationBasedOnExampleData.Rmd’ (11673 bytes), ‘Vignette-example-data.bib’ (3946 bytes), ‘genotype-simulation.bib’ (41426 bytes), ‘plos-genetics.csl’ (956 bytes), ‘sample-scripts-external-genotype-simulation.html’ (7839 bytes)
--- failed re-building ‘Sample-scripts-external-genotype-simulation.Rmd’

--- re-building ‘Simulation-and-LinearModel.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
--- finished re-building ‘Simulation-and-LinearModel.Rmd’

--- re-building ‘SimulationBasedOnExampleData.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
--- finished re-building ‘SimulationBasedOnExampleData.Rmd’

SUMMARY: processing the following file failed:
  ‘Sample-scripts-external-genotype-simulation.Rmd’

Error: Vignette re-building failed.
Execution halted