Running examples in ‘rchallenge-Ex.R’ failed
The error most likely occurred in:

> base::assign(".ptime", proc.time(), pos = "CheckExEnv")
> ### Name: icon
> ### Title: HTML code for icons.
> ### Aliases: icon
> 
> ### ** Examples
> 
> rmd <- '
+ ```{r}
+ library(rchallenge)
+ ```
+ <link rel="stylesheet" 
+  href="https://maxcdn.bootstrapcdn.com/font-awesome/4.6.3/css/font-awesome.min.css">
+ `r icon("fa-user")`
+ `r icon("fa-user fa-lg")`
+ `r icon("fa-user fa-2x")`
+ `r icon("fa-user fa-3x")`
+ `r icon("fa-user fa-3x fa-border")`
+ '
> file <- tempfile()
> cat(rmd, file=file)
> writeLines(readLines(file))

```{r}
library(rchallenge)
```
<link rel="stylesheet" 
 href="https://maxcdn.bootstrapcdn.com/font-awesome/4.6.3/css/font-awesome.min.css">
`r icon("fa-user")`
`r icon("fa-user fa-lg")`
`r icon("fa-user fa-2x")`
`r icon("fa-user fa-3x")`
`r icon("fa-user fa-3x fa-border")`
> rmarkdown::render(file)
/usr/bin/pandoc +RTS -K512m -RTS file512e50a78977.utf8.md --to html4 --from markdown+autolink_bare_uris+tex_math_single_backslash+smart --output file512e50a78977.html --email-obfuscation none --self-contained --standalone --section-divs --template /home/hornik/tmp/R.check/r-patched-gcc/Work/build/Packages/rmarkdown/rmd/h/default.html --no-highlight --variable highlightjs=1 --variable 'theme:bootstrap' --include-in-header /tmp/RtmpDCc5jl/rmarkdown-str512e5e55eed2.html --mathjax --variable 'mathjax-url:https://mathjax.rstudio.com/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML' --lua-filter /home/hornik/tmp/R.check/r-patched-gcc/Work/build/Packages/rmarkdown/rmd/lua/pagebreak.lua --lua-filter /home/hornik/tmp/R.check/r-patched-gcc/Work/build/Packages/rmarkdown/rmd/lua/latex-div.lua 
[WARNING] This document format requires a nonempty <title> element.
  Defaulting to 'file512e50a78977.utf8' as the title.
  To specify a title, use 'title' in metadata or --metadata title="...".
Could not fetch https://maxcdn.bootstrapcdn.com/font-awesome/4.6.3/fonts/fontawesome-webfont.eot?v=4.6.3
HttpExceptionRequest Request {
  host                 = "maxcdn.bootstrapcdn.com"
  port                 = 443
  secure               = True
  requestHeaders       = []
  path                 = "/font-awesome/4.6.3/fonts/fontawesome-webfont.eot"
  queryString          = "?v=4.6.3"
  method               = "GET"
  proxy                = Nothing
  rawBody              = False
  redirectCount        = 10
  responseTimeout      = ResponseTimeoutDefault
  requestVersion       = HTTP/1.1
}
 ResponseTimeout
Error: pandoc document conversion failed with error 61
Execution halted