Error(s) in re-building vignettes:
--- re-building ‘billboarder-intro.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Quitting from lines 40-47 (billboarder-intro.Rmd) 
Error: processing vignette 'billboarder-intro.Rmd' failed with diagnostics:
invalid 'path' argument
--- failed re-building ‘billboarder-intro.Rmd’

--- re-building ‘billboarder-mapping.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Quitting from lines 43-45 (billboarder-mapping.Rmd) 
Error: processing vignette 'billboarder-mapping.Rmd' failed with diagnostics:
invalid 'path' argument
--- failed re-building ‘billboarder-mapping.Rmd’

--- re-building ‘billboarder-options.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Quitting from lines 25-28 (billboarder-options.Rmd) 
Error: processing vignette 'billboarder-options.Rmd' failed with diagnostics:
invalid 'path' argument
--- failed re-building ‘billboarder-options.Rmd’

--- re-building ‘billboarder.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Quitting from lines 46-66 (billboarder.Rmd) 
Error: processing vignette 'billboarder.Rmd' failed with diagnostics:
invalid 'path' argument
--- failed re-building ‘billboarder.Rmd’

--- re-building ‘lines-options.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Quitting from lines 52-54 (lines-options.Rmd) 
Error: processing vignette 'lines-options.Rmd' failed with diagnostics:
invalid 'path' argument
--- failed re-building ‘lines-options.Rmd’

--- re-building ‘linked-tooltip.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Quitting from lines 58-59 (linked-tooltip.Rmd) 
Error: processing vignette 'linked-tooltip.Rmd' failed with diagnostics:
invalid 'path' argument
--- failed re-building ‘linked-tooltip.Rmd’

SUMMARY: processing the following files failed:
  ‘billboarder-intro.Rmd’ ‘billboarder-mapping.Rmd’
  ‘billboarder-options.Rmd’ ‘billboarder.Rmd’ ‘lines-options.Rmd’
  ‘linked-tooltip.Rmd’

Error: Vignette re-building failed.
Execution halted