Error(s) in re-building vignettes:
--- re-building ‘analyzing-medical-innovation-data.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  no font could be found for family "Arial"
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  no font could be found for family "Arial"
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  no font could be found for family "Arial"
Quitting from lines 93-97 (analyzing-medical-innovation-data.Rmd) 
Error: processing vignette 'analyzing-medical-innovation-data.Rmd' failed with diagnostics:
invalid value specified for graphical parameter "omi"
--- failed re-building ‘analyzing-medical-innovation-data.Rmd’

--- re-building ‘introduction-to-netdiffuser.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  no font could be found for family "Arial"
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  no font could be found for family "Arial"
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  no font could be found for family "Arial"
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  no font could be found for family "Arial"
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  no font could be found for family "Arial"
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  no font could be found for family "Arial"
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  no font could be found for family "Arial"
Quitting from lines 75-76 (introduction-to-netdiffuser.Rmd) 
Error: processing vignette 'introduction-to-netdiffuser.Rmd' failed with diagnostics:
invalid value specified for graphical parameter "omi"
--- failed re-building ‘introduction-to-netdiffuser.Rmd’

--- re-building ‘not-lost-in-translation-importing-and-exporting-graphs.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 ‘not-lost-in-translation-importing-and-exporting-graphs.Rmd’

--- re-building ‘time_discount_suscep_infect.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 ‘time_discount_suscep_infect.Rmd’

SUMMARY: processing the following files failed:
  ‘analyzing-medical-innovation-data.Rmd’
  ‘introduction-to-netdiffuser.Rmd’

Error: Vignette re-building failed.
Execution halted