Error in re-building vignettes:
  ...
Package:  lifecontingencies
Authors:  Giorgio Alfredo Spedicato [cre,aut], Reinhold Kainhofer [ctb], Kevin J.
    Owens [ctb], Christophe Dutang [ctb], Ernesto Schirmacher[ctb], Gian Paolo Clemente [ctb]
Version:  1.3.5
Date:     2018-09-18 22:30:02 UTC
BugReport: http://github.com/spedygiorgio/lifecontingencies/issues

Loading required package: markovchain
Package:  markovchain
Version:  0.6.9.12
Date:     2018-08-23
BugReport: http://github.com/spedygiorgio/markovchain/issues

Loading required package: parallel
Loading required package: forecast
This is demography 1.20 

Warning in fts(ages, t(res), frequency = 1/deltat, start = years[1], xname = "Age",  :
  Please assign column name for the data matrix.
Warning in fts(ages, t(fit), frequency = 1/deltat, start = years[1], xname = "Age",  :
  Please assign column name for the data matrix.
Warning in fts(ages, t(mx), start = years[1], frequency = 1/deltat, xname = "Age",  :
  Please assign column name for the data matrix.
Warning in fts(ages, t(res), frequency = 1/deltat, start = years[1], xname = "Age",  :
  Please assign column name for the data matrix.
Warning in fts(ages, t(fit), frequency = 1/deltat, start = years[1], xname = "Age",  :
  Please assign column name for the data matrix.
Warning in fts(ages, t(mx), start = years[1], frequency = 1/deltat, xname = "Age",  :
  Please assign column name for the data matrix.
Warning in fts(ages, t(res), frequency = 1/deltat, start = years[1], xname = "Age",  :
  Please assign column name for the data matrix.
Warning in fts(ages, t(fit), frequency = 1/deltat, start = years[1], xname = "Age",  :
  Please assign column name for the data matrix.
Warning in fts(ages, t(mx), start = years[1], frequency = 1/deltat, xname = "Age",  :
  Please assign column name for the data matrix.
Warning in fts(ages, t(res), frequency = 1/deltat, start = years[1], xname = "Age",  :
  Please assign column name for the data matrix.
Warning in fts(ages, t(fit), frequency = 1/deltat, start = years[1], xname = "Age",  :
  Please assign column name for the data matrix.
Warning in fts(ages, t(mx), start = years[1], frequency = 1/deltat, xname = "Age",  :
  Please assign column name for the data matrix.
Error: processing vignette 'introToLifecontingencies.Rmd' failed with diagnostics:
pandoc document conversion failed with error 15
Execution halted