Error(s) in re-building vignettes:
--- re-building ‘Data_Analysis_with_augmentedRCBD.Rmd’ using rmarkdown_notangle
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
trying URL 'https://www.r-project.org/logo/Rlogo.png'
Content type 'image/png' length 48148 bytes (47 KB)
==================================================
downloaded 47 KB

trying URL 'https://raw.githubusercontent.com/aravind-j/augmentedRCBD/master/vignettes/rbase.png'
Content type 'image/png' length 57299 bytes (55 KB)
==================================================
downloaded 55 KB

trying URL 'https://github.com/aravind-j/augmentedRCBD/raw/master/vignettes/rstudio.png'
Content type 'image/png' length 91730 bytes (89 KB)
==================================================
downloaded 89 KB

trying URL 'https://github.com/aravind-j/augmentedRCBD/raw/master/vignettes/rstudio%20panes.png'
Content type 'image/png' length 86653 bytes (84 KB)
==================================================
downloaded 84 KB

Warning in doTryCatch(return(expr), name, parentenv, handler) :
  font "Helvetica" could not be found for family "sans"
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  font "Helvetica" could not be found for family "sans"
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  font "Helvetica" could not be found for family "sans"
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  font "Helvetica" could not be found for family "sans"
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  font "Helvetica" could not be found for family "sans"
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  font "Helvetica" could not be found for family "sans"
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  font "Helvetica" could not be found for family "sans"
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  font "Helvetica" could not be found for family "sans"
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  font "Helvetica" could not be found for family "sans"
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  font "Helvetica" could not be found for family "sans"
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  font "Helvetica" could not be found for family "sans"
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  font "Helvetica" could not be found for family "sans"
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  font "Helvetica" could not be found for family "sans"
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  font "Helvetica" could not be found for family "sans"
Warning in doTryCatch(return(expr), name, parentenv, handler) :
  font "Helvetica" could not be found for family "sans"
Quitting from lines 961-968 (Data_Analysis_with_augmentedRCBD.Rmd) 
Error: processing vignette 'Data_Analysis_with_augmentedRCBD.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘Data_Analysis_with_augmentedRCBD.Rmd’

SUMMARY: processing the following file failed:
  ‘Data_Analysis_with_augmentedRCBD.Rmd’

Error: Vignette re-building failed.
Execution halted