Error(s) in re-building vignettes:
  ...
--- re-building ‘an_introduction_to_lifecontingencies_package.Rnw’ using Sweave
Package:  lifecontingencies
Authors:  Giorgio Alfredo Spedicato [aut, cre]
    (<https://orcid.org/0000-0002-0315-8888>),
  Christophe Dutang [ctb] (<https://orcid.org/0000-0001-6732-1501>),
  Reinhold Kainhofer [ctb] (<https://orcid.org/0000-0002-7895-1311>),
  Kevin J Owens [ctb],
  Ernesto Schirmacher [ctb],
  Gian Paolo Clemente [ctb] (<https://orcid.org/0000-0001-6795-4595>),
  Ivan Williams [ctb]
Version:  1.3.6
Date:     2019-03-05 23:50:03 UTC
BugReport: http://github.com/spedygiorgio/lifecontingencies/issues

Loading required package: markovchain
Package:  markovchain
Version:  0.8.2
Date:     2020-01-10
BugReport: http://github.com/spedygiorgio/markovchain/issues

Loading required package: parallel
--- finished re-building 'an_introduction_to_lifecontingencies_package.Rnw'

--- re-building ‘mortality_projection.Rnw’ using Sweave

Error: processing vignette 'mortality_projection.Rnw' failed with diagnostics:
 chunk 2 (label = load) 
Error in library(demography) : there is no package called ‘demography’

--- failed re-building ‘mortality_projection.Rnw’

--- re-building ‘PensionPlanVal.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 ‘PensionPlanVal.Rmd’

--- re-building ‘compute-detail.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 ‘compute-detail.Rmd’

--- re-building ‘introToLifecontingencies.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.
Package:  lifecontingencies
Authors:  Giorgio Alfredo Spedicato [aut, cre]
    (<https://orcid.org/0000-0002-0315-8888>),
  Christophe Dutang [ctb] (<https://orcid.org/0000-0001-6732-1501>),
  Reinhold Kainhofer [ctb] (<https://orcid.org/0000-0002-7895-1311>),
  Kevin J Owens [ctb],
  Ernesto Schirmacher [ctb],
  Gian Paolo Clemente [ctb] (<https://orcid.org/0000-0001-6795-4595>),
  Ivan Williams [ctb]
Version:  1.3.6
Date:     2019-03-05 23:50:03 UTC
BugReport: http://github.com/spedygiorgio/lifecontingencies/issues

Quitting from lines 232-237 (introToLifecontingencies.Rmd) 
Error: processing vignette 'introToLifecontingencies.Rmd' failed with diagnostics:
there is no package called 'demography'
--- failed re-building ‘introToLifecontingencies.Rmd’

--- re-building ‘pensionfunding.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 ‘pensionfunding.Rmd’

SUMMARY: processing the following files failed:
  ‘mortality_projection.Rnw’ ‘introToLifecontingencies.Rmd’

Error: Vignette re-building failed.
Execution halted