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:  1.3.7
Date:     2021-03-21 22:00:02 UTC
BugReport: https://github.com/spedygiorgio/lifecontingencies/issues

Loading required package: markovchain
Package:  markovchain
Version:  0.8.6
Date:     2021-05-17
BugReport: https://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
Loading required package: forecast
This is demography 1.22 

Loading required package: StMoMo
Loading required package: gnm
--- finished re-building 'mortality_projection.Rnw'

--- re-building 'PensionPlanVal.Rmd' using rmarkdown
--- finished re-building 'PensionPlanVal.Rmd'

--- re-building 'compute-detail.Rmd' using rmarkdown
--- finished re-building 'compute-detail.Rmd'

--- re-building 'introToLifecontingencies.Rmd' using rmarkdown
! Undefined control sequence.
\beamer@doifinframe ...lts for 1920 cohort,''``\n 
                                                  '')\#\# Results for 1920 c...
l.527 \end{frame}

Error: processing vignette 'introToLifecontingencies.Rmd' failed with diagnostics:
LaTeX failed to compile C:/r_packages/pkgcheck/CRAN/lifecontingencies/lifecontingencies.Rcheck/vign_test/lifecontingencies/vignettes/introToLifecontingencies.tex. See https://yihui.org/tinytex/r/#debugging for debugging tips. See introToLifecontingencies.log for more info.
--- failed re-building 'introToLifecontingencies.Rmd'

--- re-building 'pensionfunding.Rmd' using rmarkdown
--- finished re-building 'pensionfunding.Rmd'

SUMMARY: processing the following file failed:
  'introToLifecontingencies.Rmd'

Error: Vignette re-building failed.
Execution halted