Error(s) in re-building vignettes:
  ...
--- re-building ‘basic-dutils.Rmd’ using rmarkdown
Quitting from lines 327-328 (basic-dutils.Rmd) 
Error: processing vignette ‘basic-dutils.Rmd’ failed with diagnostics:
‘x’ must be numeric
--- failed re-building ‘basic-dutils.Rmd’

--- re-building ‘binomial-family.Rmd’ using rmarkdown
Quitting from lines 348-356 (binomial-family.Rmd) 
Error: processing vignette ‘binomial-family.Rmd’ failed with diagnostics:
cannot xtfrm data frames
--- failed re-building ‘binomial-family.Rmd’

--- re-building ‘binomial-twin.Rmd’ using rmarkdown
--- finished re-building ‘binomial-twin.Rmd’

--- re-building ‘binreg-ate.Rmd’ using rmarkdown
--- finished re-building ‘binreg-ate.Rmd’

--- re-building ‘binreg.Rmd’ using rmarkdown
Quitting from lines 152-161 (binreg.Rmd) 
Error: processing vignette ‘binreg.Rmd’ failed with diagnostics:
‘x’ must be numeric
--- failed re-building ‘binreg.Rmd’

--- re-building ‘cifreg.Rmd’ using rmarkdown
--- finished re-building ‘cifreg.Rmd’

--- re-building ‘haplo-discrete-ttp.Rmd’ using rmarkdown
--- finished re-building ‘haplo-discrete-ttp.Rmd’

--- re-building ‘interval-discrete-survival.Rmd’ using rmarkdown
--- finished re-building ‘interval-discrete-survival.Rmd’

--- re-building ‘marginal-cox.Rmd’ using rmarkdown
--- finished re-building ‘marginal-cox.Rmd’

--- re-building ‘quantitative-twin.Rmd’ using rmarkdown
Loading required package: ggplot2

Attaching package: 'ggplot2'

The following object is masked from 'package:lava':

    vars

--- finished re-building ‘quantitative-twin.Rmd’

--- re-building ‘recurrent-events.Rmd’ using rmarkdown
--- finished re-building ‘recurrent-events.Rmd’

--- re-building ‘time-to-event-family-studies-arev.Rmd’ using rmarkdown
--- finished re-building ‘time-to-event-family-studies-arev.Rmd’

--- re-building ‘twostage-survival.Rmd’ using rmarkdown
--- finished re-building ‘twostage-survival.Rmd’

SUMMARY: processing the following files failed:
  ‘basic-dutils.Rmd’ ‘binomial-family.Rmd’ ‘binreg.Rmd’

Error: Vignette re-building failed.
Execution halted