title: pandoc document conversion failed with error 2
body: <p>when I knit HTML in R studio, I get this:</p>
  
  <blockquote>
    <p>"C:/Users/Susan/ANACON~1/Scripts/pandoc" +RTS -K512m -RTS lesson3_student.utf8.md --to html --from markdown+autolink_bare_uris+ascii_identifiers+tex_math_single_backslash --output lesson3_student.html --smart --email-obfuscation none --self-contained --standalone --section-divs --template "C:\Users\Susan\Documents\R\win-library\3.3\rmarkdown\rmd\h\default.html" --no-highlight --variable highlightjs=1 --variable "theme:bootstrap" --include-in-header "C:\Users\Susan\AppData\Local\Temp\RtmpaUaaRx\rmarkdown-str3cf45da21737.html" --mathjax --variable "mathjax-url:<a href="https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML" rel="noreferrer">https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML</a>" 
    output file: lesson3_student.knit.md</p>
    
    <p>unrecognized option `--smart'
    Try pandoc.exe --help for more information.
    Error: pandoc document conversion failed with error 2
    In addition: Warning message:
    running command '"C:/Users/Susan/ANACON~1/Scripts/pandoc" +RTS -K512m -RTS lesson3_student.utf8.md --to html --from markdown+autolink_bare_uris+ascii_identifiers+tex_math_single_backslash --output lesson3_student.html --smart --email-obfuscation none --self-contained --standalone --section-divs --template "C:\Users\Susan\Documents\R\win-library\3.3\rmarkdown\rmd\h\default.html" --no-highlight --variable highlightjs=1 --variable "theme:bootstrap" --include-in-header "C:\Users\Susan\AppData\Local\Temp\RtmpaUaaRx\rmarkdown-str3cf45da21737.html" --mathjax --variable "mathjax-url:<a href="https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML" rel="noreferrer">https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML</a>"' had status 2 
    Execution halted</p>
  </blockquote>
  
  <p>Can someone give me an idea what went wrong and how to fix it?</p>
  
  <p>Thank you</p>