Error(s) in re-building vignettes:
  ...
--- re-building ‘ProFound-Colour.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
XIO:  fatal IO error 146 (Connection refused) on X server ":5.0"
      after 0 requests (0 known processed) with 0 events remaining.
--- re-building ‘ProFound-Complex-Fit.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
--- finished re-building ‘ProFound-Complex-Fit.Rmd’

--- re-building ‘ProFound-Segim-Maps.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.
--- finished re-building ‘ProFound-Segim-Maps.Rmd’

--- re-building ‘ProFound-Simulated-Images.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.
--- finished re-building ‘ProFound-Simulated-Images.Rmd’

--- re-building ‘ProFound-Sky_Shenanigans.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.
--- finished re-building ‘ProFound-Sky_Shenanigans.Rmd’

--- re-building ‘ProFound-Source-Finding.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.
--- finished re-building ‘ProFound-Source-Finding.Rmd’

--- re-building ‘ProFound-Stack-Images.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.
--- finished re-building ‘ProFound-Stack-Images.Rmd’

--- re-building ‘ProFound-TipsTricks.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.
--- finished re-building ‘ProFound-TipsTricks.Rmd’

SUMMARY: processing the following file failed:
  ‘ProFound-Colour.Rmd’

Error: Vignette re-building failed.
Execution halted