Error(s) in re-building vignettes:
  ...
--- re-building ‘GxE_testing.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Warning in knit(input, text = text, envir = envir, quiet = quiet) :
  The file "GxE_testing.Rmd" should be encoded in UTF-8. Now I will try to read it with the system native encoding (which may not be correct). We will only support UTF-8 in the near future. Please see https://yihui.name/en/2018/11/biggest-regret-knitr/ for more info.
Warning in grep("\n", x) : input string 14 is invalid in this locale
Warning in grep("^(---|\\.\\.\\.)\\s*$", lines) :
  input string 14 is invalid in this locale
Warning in grepl(chunk.begin, lines) :
  input string 14 is invalid in this locale
Warning in grepl(chunk.end, lines) :
  input string 14 is invalid in this locale
Quitting from lines 2-22 (GxE_testing.Rmd) 
Error: processing vignette 'GxE_testing.Rmd' failed with diagnostics:
invalid multibyte string, element 1
--- failed re-building ‘GxE_testing.Rmd’

--- re-building ‘LEGIT.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Warning in knit(input, text = text, envir = envir, quiet = quiet) :
  The file "LEGIT.Rmd" should be encoded in UTF-8. Now I will try to read it with the system native encoding (which may not be correct). We will only support UTF-8 in the near future. Please see https://yihui.name/en/2018/11/biggest-regret-knitr/ for more info.
Warning in grep("\n", x) : input string 14 is invalid in this locale
Warning in grep("^(---|\\.\\.\\.)\\s*$", lines) :
  input string 14 is invalid in this locale
Warning in grepl(chunk.begin, lines) :
  input string 14 is invalid in this locale
Warning in grepl(chunk.end, lines) :
  input string 14 is invalid in this locale
Quitting from lines 2-109 (LEGIT.Rmd) 
Error: processing vignette 'LEGIT.Rmd' failed with diagnostics:
invalid multibyte string, element 1
--- failed re-building ‘LEGIT.Rmd’

SUMMARY: processing the following files failed:
  ‘GxE_testing.Rmd’ ‘LEGIT.Rmd’

Error: Vignette re-building failed.
Execution halted