Error(s) in re-building vignettes:
  ...
--- re-building ‘Tplyr.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Quitting from lines 20-27 (Tplyr.Rmd) 
Error: processing vignette 'Tplyr.Rmd' failed with diagnostics:
there is no package called 'tidyverse'
--- failed re-building ‘Tplyr.Rmd’

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

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

--- re-building ‘desc.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Quitting from lines 20-26 (desc.Rmd) 
Error: processing vignette 'desc.Rmd' failed with diagnostics:
there is no package called 'tidyverse'
--- failed re-building ‘desc.Rmd’

--- re-building ‘options.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Quitting from lines 20-28 (options.Rmd) 
Error: processing vignette 'options.Rmd' failed with diagnostics:
there is no package called 'tidyverse'
--- failed re-building ‘options.Rmd’

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

--- re-building ‘table.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Quitting from lines 20-26 (table.Rmd) 
Error: processing vignette 'table.Rmd' failed with diagnostics:
there is no package called 'tidyverse'
--- failed re-building ‘table.Rmd’

SUMMARY: processing the following files failed:
  ‘Tplyr.Rmd’ ‘desc.Rmd’ ‘options.Rmd’ ‘table.Rmd’

Error: Vignette re-building failed.
Execution halted