Error(s) in re-building vignettes:
--- re-building 'index.Rmd' using rmarkdown
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  "fig.height" is not a graphical parameter
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  "fig.width" is not a graphical parameter
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  "fig.height" is not a graphical parameter
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  "fig.width" is not a graphical parameter
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  "fig.height" is not a graphical parameter
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  "fig.width" is not a graphical parameter
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  "fig.height" is not a graphical parameter
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  "fig.width" is not a graphical parameter
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  "fig.height" is not a graphical parameter
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  "fig.width" is not a graphical parameter
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  "fig.height" is not a graphical parameter
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  "fig.width" is not a graphical parameter
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  "fig.height" is not a graphical parameter
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  "fig.width" is not a graphical parameter
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  "fig.height" is not a graphical parameter
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  "fig.width" is not a graphical parameter
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  "fig.height" is not a graphical parameter
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  "fig.width" is not a graphical parameter
Quitting from lines 142-145 (index.Rmd) 
Error: processing vignette 'index.Rmd' failed with diagnostics:
invalid printing digits 0
--- failed re-building 'index.Rmd'

SUMMARY: processing the following file failed:
  'index.Rmd'

Error: Vignette re-building failed.
Execution halted