Error(s) in re-building vignettes:
--- re-building ‘DBI-1.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Error: processing vignette 'DBI-1.Rmd' failed with diagnostics:
there is no package called 'stringi'
--- failed re-building ‘DBI-1.Rmd’

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

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

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

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

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

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

SUMMARY: processing the following files failed:
  ‘DBI-1.Rmd’ ‘DBI-advanced.Rmd’ ‘DBI-history.Rmd’ ‘DBI-proposal.Rmd’
  ‘DBI.Rmd’ ‘backend.Rmd’ ‘spec.Rmd’

Error: Vignette re-building failed.
Execution halted