Error(s) in re-building vignettes:
  ...
--- re-building 'markdown-examples.Rmd' using knitr
--- finished re-building 'markdown-examples.Rmd'

--- re-building 'markdown-output.Rmd' using knitr
Read 2 items
Warning in xfun::read_utf8(file) :
  The file markdown-output.md is not encoded in UTF-8. These lines contain invalid UTF-8 characters: 94, 108
Warning in grep("\n", x) :
  unable to translate '<p><U+00BD> <a9></p>' to a wide string
Warning in grep("\n", x) : input string 94 is invalid
Warning in grep("\n", x) :
  unable to translate '<p><U+00BD> <U+2153> <U+2154> <U+00BC> <U+00BE> <U+2155> <U+2156> <U+2157> <U+2158> <U+2159> <U+215A> <U+215B> <U+215C> <U+215D> <U+215E> <U+2150> <U+2151> <U+2152> <a9> <ae> <U+2122> <code>1/2</code> <code>1/3</code> <code>2/3</code> <code>1/4</code> ...' to a wide string
Warning in grep("\n", x) : input string 108 is invalid
Warning in grep("^---\\s*$", x) :
  unable to translate '<p><U+00BD> <a9></p>' to a wide string
Warning in grep("^---\\s*$", x) : input string 94 is invalid
Warning in grep("^---\\s*$", x) :
  unable to translate '<p><U+00BD> <U+2153> <U+2154> <U+00BC> <U+00BE> <U+2155> <U+2156> <U+2157> <U+2158> <U+2159> <U+215A> <U+215B> <U+215C> <U+215D> <U+215E> <U+2150> <U+2151> <U+2152> <a9> <ae> <U+2122> <code>1/2</code> <code>1/3</code> <code>2/3</code> <code>1/4</code> ...' to a wide string
Warning in grep("^---\\s*$", x) : input string 108 is invalid
Warning in grep("\n", x) :
  unable to translate '<p><U+00BD> <a9></p>' to a wide string
Warning in grep("\n", x) : input string 94 is invalid
Warning in grep("\n", x) :
  unable to translate '<p><U+00BD> <U+2153> <U+2154> <U+00BC> <U+00BE> <U+2155> <U+2156> <U+2157> <U+2158> <U+2159> <U+215A> <U+215B> <U+215C> <U+215D> <U+215E> <U+2150> <U+2151> <U+2152> <a9> <ae> <U+2122> <code>1/2</code> <code>1/3</code> <code>2/3</code> <code>1/4</code> ...' to a wide string
Warning in grep("\n", x) : input string 108 is invalid
Warning in grep(r, x) :
  unable to translate '<p><U+00BD> <a9></p>' to a wide string
Warning in grep(r, x) : input string 94 is invalid
Warning in grep(r, x) :
  unable to translate '<p><U+00BD> <U+2153> <U+2154> <U+00BC> <U+00BE> <U+2155> <U+2156> <U+2157> <U+2158> <U+2159> <U+215A> <U+215B> <U+215C> <U+215D> <U+215E> <U+2150> <U+2151> <U+2152> <a9> <ae> <U+2122> <code>1/2</code> <code>1/3</code> <code>2/3</code> <code>1/4</code> ...' to a wide string
Warning in grep(r, x) : input string 108 is invalid
Warning in grep("-->\\s*$", x) :
  unable to translate '<p><U+00BD> <a9></p>' to a wide string
Warning in grep("-->\\s*$", x) : input string 94 is invalid
Warning in grep("-->\\s*$", x) :
  unable to translate '<p><U+00BD> <U+2153> <U+2154> <U+00BC> <U+00BE> <U+2155> <U+2156> <U+2157> <U+2158> <U+2159> <U+215A> <U+215B> <U+215C> <U+215D> <U+215E> <U+2150> <U+2151> <U+2152> <a9> <ae> <U+2122> <code>1/2</code> <code>1/3</code> <code>2/3</code> <code>1/4</code> ...' to a wide string
Warning in grep("-->\\s*$", x) : input string 108 is invalid
Warning in gregexpr(r, x, perl = TRUE) :
  input string 57 is invalid UTF-8
Warning in gregexpr(r, x, perl = TRUE) :
  input string 63 is invalid UTF-8
Warning in grep(pattern, text, perl = TRUE) :
  input string 94 is invalid UTF-8
Warning in grep(pattern, text, perl = TRUE) :
  input string 108 is invalid UTF-8
Warning in grep(id, text, fixed = TRUE) :
  input string 94 is invalid UTF-8
Warning in grep(id, text, fixed = TRUE) :
  input string 108 is invalid UTF-8
Warning in grep(id, text, fixed = TRUE) :
  input string 94 is invalid UTF-8
Warning in grep(id, text, fixed = TRUE) :
  input string 108 is invalid UTF-8
Warning in grep(r, x) :
  unable to translate '<p><U+00BD> <a9></p>' to a wide string
Warning in grep(r, x) : input string 94 is invalid
Warning in grep(r, x) :
  unable to translate '<p><U+00BD> <U+2153> <U+2154> <U+00BC> <U+00BE> <U+2155> <U+2156> <U+2157> <U+2158> <U+2159> <U+215A> <U+215B> <U+215C> <U+215D> <U+215E> <U+2150> <U+2151> <U+2152> <a9> <ae> <U+2122> <code>1/2</code> <code>1/3</code> <code>2/3</code> <code>1/4</code> ...' to a wide string
Warning in grep(r, x) : input string 108 is invalid
Warning in grep("-->\\s*$", x) :
  unable to translate '<p><U+00BD> <a9></p>' to a wide string
Warning in grep("-->\\s*$", x) : input string 94 is invalid
Warning in grep("-->\\s*$", x) :
  unable to translate '<p><U+00BD> <U+2153> <U+2154> <U+00BC> <U+00BE> <U+2155> <U+2156> <U+2157> <U+2158> <U+2159> <U+215A> <U+215B> <U+215C> <U+215D> <U+215E> <U+2150> <U+2151> <U+2152> <a9> <ae> <U+2122> <code>1/2</code> <code>1/3</code> <code>2/3</code> <code>1/4</code> ...' to a wide string
Warning in grep("-->\\s*$", x) : input string 108 is invalid
Warning in gregexpr("(?<=^|[\\s])[$](?! )[^$]+?(?<! )[$](?![$0123456789])",  :
  input string 57 is invalid UTF-8
Warning in gregexpr("(?<=^|[\\s])[$](?! )[^$]+?(?<! )[$](?![$0123456789])",  :
  input string 63 is invalid UTF-8
Warning in gregexpr("(?<=^|[\\s])[$][$](?! )[^$]+?(?<! )[$][$]", x, perl = TRUE) :
  input string 57 is invalid UTF-8
Warning in gregexpr("(?<=^|[\\s])[$][$](?! )[^$]+?(?<! )[$][$]", x, perl = TRUE) :
  input string 63 is invalid UTF-8
Warning in gregexpr("[$]", x) :
  unable to translate '<p><U+00BD> <a9></p>' to a wide string
Warning in gregexpr("[$]", x) : input string 57 is invalid
Warning in gregexpr("[$]", x) :
  unable to translate '<p><U+00BD> <U+2153> <U+2154> <U+00BC> <U+00BE> <U+2155> <U+2156> <U+2157> <U+2158> <U+2159> <U+215A> <U+215B> <U+215C> <U+215D> <U+215E> <U+2150> <U+2151> <U+2152> <a9> <ae> <U+2122> <code>1/2</code> <code>1/3</code> <code>2/3</code> <code>1/4</code> ...' to a wide string
Warning in gregexpr("[$]", x) : input string 63 is invalid
Warning in grep("^\\\\begin\\{[^}]+\\}$", x) :
  unable to translate '<p><U+00BD> <a9></p>' to a wide string
Warning in grep("^\\\\begin\\{[^}]+\\}$", x) :
  input string 57 is invalid
Warning in grep("^\\\\begin\\{[^}]+\\}$", x) :
  unable to translate '<p><U+00BD> <U+2153> <U+2154> <U+00BC> <U+00BE> <U+2155> <U+2156> <U+2157> <U+2158> <U+2159> <U+215A> <U+215B> <U+215C> <U+215D> <U+215E> <U+2150> <U+2151> <U+2152> <a9> <ae> <U+2122> <code>1/2</code> <code>1/3</code> <code>2/3</code> <code>1/4</code> ...' to a wide string
Warning in grep("^\\\\begin\\{[^}]+\\}$", x) :
  input string 63 is invalid
Warning in grep("^\\\\end\\{[^}]+\\}$", x) :
  unable to translate '<p><U+00BD> <a9></p>' to a wide string
Warning in grep("^\\\\end\\{[^}]+\\}$", x) : input string 57 is invalid
Warning in grep("^\\\\end\\{[^}]+\\}$", x) :
  unable to translate '<p><U+00BD> <U+2153> <U+2154> <U+00BC> <U+00BE> <U+2155> <U+2156> <U+2157> <U+2158> <U+2159> <U+215A> <U+215B> <U+215C> <U+215D> <U+215E> <U+2150> <U+2151> <U+2152> <a9> <ae> <U+2122> <code>1/2</code> <code>1/3</code> <code>2/3</code> <code>1/4</code> ...' to a wide string
Warning in grep("^\\\\end\\{[^}]+\\}$", x) : input string 63 is invalid
Warning in grep(pattern, text, perl = TRUE) :
  input string 94 is invalid UTF-8
Warning in grep(pattern, text, perl = TRUE) :
  input string 108 is invalid UTF-8
Warning in grep(id, text, fixed = TRUE) :
  input string 94 is invalid UTF-8
Warning in grep(id, text, fixed = TRUE) :
  input string 108 is invalid UTF-8
Warning in grep(r, x) :
  unable to translate '<p><U+00BD> <a9></p>' to a wide string
Warning in grep(r, x) : input string 94 is invalid
Warning in grep(r, x) :
  unable to translate '<p><U+00BD> <U+2153> <U+2154> <U+00BC> <U+00BE> <U+2155> <U+2156> <U+2157> <U+2158> <U+2159> <U+215A> <U+215B> <U+215C> <U+215D> <U+215E> <U+2150> <U+2151> <U+2152> <a9> <ae> <U+2122> <code>1/2</code> <code>1/3</code> <code>2/3</code> <code>1/4</code> ...' to a wide string
Warning in grep(r, x) : input string 108 is invalid
Warning in grep("-->\\s*$", x) :
  unable to translate '<p><U+00BD> <a9></p>' to a wide string
Warning in grep("-->\\s*$", x) : input string 94 is invalid
Warning in grep("-->\\s*$", x) :
  unable to translate '<p><U+00BD> <U+2153> <U+2154> <U+00BC> <U+00BE> <U+2155> <U+2156> <U+2157> <U+2158> <U+2159> <U+215A> <U+215B> <U+215C> <U+215D> <U+215E> <U+2150> <U+2151> <U+2152> <a9> <ae> <U+2122> <code>1/2</code> <code>1/3</code> <code>2/3</code> <code>1/4</code> ...' to a wide string
Warning in grep("-->\\s*$", x) : input string 108 is invalid
Warning in gregexpr(pattern, x, ...) : input string 57 is invalid UTF-8
Warning in gregexpr(pattern, x, ...) : input string 63 is invalid UTF-8
Warning in grep(pattern, text, perl = TRUE) :
  input string 94 is invalid UTF-8
Warning in grep(pattern, text, perl = TRUE) :
  input string 108 is invalid UTF-8
Warning in grep(id, text, fixed = TRUE) :
  input string 94 is invalid UTF-8
Warning in grep(id, text, fixed = TRUE) :
  input string 108 is invalid UTF-8
Warning in gregexpr(pattern, x, ...) : input string 57 is invalid UTF-8
Warning in gregexpr(pattern, x, ...) : input string 63 is invalid UTF-8
Warning in gregexpr(pattern, x, ...) : input string 57 is invalid UTF-8
Warning in gregexpr(pattern, x, ...) : input string 63 is invalid UTF-8
Warning in gsub(sprintf("<code>%s(.{5,}?)%s</code>", id, id), "\\1", ret) :
  unable to translate '<!--
%\VignetteEngine{knitr::knitr}
%\VignetteIndexEntry{HTML Output from Markdown Examples}
-->
<p>This vignette shows how the output looks like in HTML from the other vignette <code>markdown-examples.Rmd</code>, in which the literal HTML code was sho...' to a wide string
Error: processing vignette 'markdown-output.Rmd' failed with diagnostics:
input string 1 is invalid
--- failed re-building 'markdown-output.Rmd'

SUMMARY: processing the following file failed:
  'markdown-output.Rmd'

Error: Vignette re-building failed.
Execution halted