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

> ### Name: icon
> ### Title: HTML code for icons. Currently only supports Font Awesome 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)
"D:/compiler/pandoc/pandoc" +RTS -K512m -RTS file26106d85708.utf8.md --to html --from markdown+autolink_bare_uris+ascii_identifiers+tex_math_single_backslash --output file26106d85708.html --smart --email-obfuscation none --self-contained --standalone --section-divs --template "D:\temp\RtmpsDGXwa\RLIBS_35b0771874a3\rmarkdown\rmd\h\default.html" --no-highlight --variable highlightjs=1 --variable "theme:bootstrap" --include-in-header "D:\temp\RtmpymWI6K\rmarkdown-str2610bc11714.html" --mathjax --variable "mathjax-url:https://mathjax.rstudio.com/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML" 
--smart/-S has been removed.  Use +smart or -smart extension instead.
For example: pandoc -f markdown+smart -t markdown-smart.
Try pandoc.exe --help for more information.
Warning: running command '"D:/compiler/pandoc/pandoc" +RTS -K512m -RTS file26106d85708.utf8.md --to html --from markdown+autolink_bare_uris+ascii_identifiers+tex_math_single_backslash --output file26106d85708.html --smart --email-obfuscation none --self-contained --standalone --section-divs --template "D:\temp\RtmpsDGXwa\RLIBS_35b0771874a3\rmarkdown\rmd\h\default.html" --no-highlight --variable highlightjs=1 --variable "theme:bootstrap" --include-in-header "D:\temp\RtmpymWI6K\rmarkdown-str2610bc11714.html" --mathjax --variable "mathjax-url:https://mathjax.rstudio.com/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML"' had status 2
Error: pandoc document conversion failed with error 2
Execution halted