title: R markdown error in evaluate_call(...) when knitting any Rmd file
body: <p>I can no longer knit any of my Rmd files to PDF or Html. It's the same error message every time: </p>
  
  <blockquote>
    <p>Line 9 Error in evaluate_call(expr, parsed$src[[i]], envir = envir,
    enclos=enclos, : unused argument (include_timing = include_timing)
    Calls: ... call_block -> block_exec -> in_dir -> evalute ->
    evalute_call Execution halted</p>
  </blockquote>
  
  <p>Line 9 is an auto-generated line when opening a new R markdown file:</p>
  
  <p><code>{r setup, include=FALSE}
  knitr::opts_chunk$set(echo = TRUE)
  </code></p>
  
  <p>I've tried deleting it, changing <code>TRUE</code> to <code>FALSE</code>, and deleting part of it. It gives me the same error message stopped on the same line. </p>