RStudio failing to knit RMarkdown Document

rmarkdown

#1

Lately I can't knit my rmarkdown documents. No problem in the past. Recently been upgraded to R version 3.5.1 and RStudio version 1.1.456, Windows 7

---
title:"Untitled"
ouput:html_document
---

```{r}
x <- 4
x
```

Rmarrkdown just spins then times out.

processing files: Untitled.Rmd
  |.............                                                             | 33%
  ordinary test without R code
  | ......................                                                   | 67%
label: unnamed-chunk-1
  |......................................................................... | 100%
  ordinary text without R code

output file: Untitled.knit.md
"C:/Program Files/RStudio/bin/pandoc/pandoc" +RTS -K512m -RTS Untitled.utf8.md --to htm14 --from markdown+autolink_bare_uris+ascii_identifiers+tex_math_single_backslash --ouput Untitled.html --smart --email-obfuscation none --self-contained --standalone --section-divs --template "<link to \default.html>" --no-highlight --variable highlightjs=1 --variable "theme"bootstrap" --include-in-header "< link to ...\Temp\RtmpYbOJYe\rmarkdown-str3ed818282clc.html>" --mathjax --variable "mathjax-url:https://mathjax.rstudio.com/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML"

pandoc.exe: Could not fetch <link to rmarkdown\rmd\h\jquery-1.11.3\jquery.min.js> FaileConnectionException2 "coe.ic.gov" 80 False connect: failed (connection timed out (WSAETIMEDOUT))
Error: pandoc document conversion failed with error 67
Execution halted

Any suggestions?

I've found that if I add the following code the problem is resolved but don't understand why.

---
title:"Untitled"
ouput:
  html_document
  self_contained: false
---