markdown latex font encoding failing

Edit: Problem solved. It turns out I had some missing packages, and rmarkdown doesn't give a very good error message for this. If anyone else has this problem, you have to use the "keep_tex" option in the yaml. You can then see in the tex file all of the required tex packages.

I'm on Windows 7. I have the latest Miktex, R, rmarkdown, rstudio.

When I try to produce a new rmarkdown document and output to pdf, it fails.

It seems to be a font encoding which is missing. I've tried searching the internet for omxenc.dfu and uenc.dfu files, but it turned up nothing. I was going to post this in the latex exchagne, but I can produce latex documents fine without using rmarkdown.

Any help would be great!

Here's the rmarkdown

---
title: "Untitled"
author: "Triceraflops"
date: "19 März 2018"
output: pdf_document
---

## R Markdown

This is an R Markdown document. Markdown is a simple formatting syntax for
authoring HTML, PDF, and MS Word documents. For more details on using R 
Markdown see <http://rmarkdown.rstudio.com>.

And here's the output of the R Markdown console

"C:/Users/triceraflops/Documents/RStudio/bin/pandoc/pandoc" +RTS -K512m -RTS missing-encoding.utf8.md --to latex --from markdown+autolink_bare_uris+ascii_identifiers+tex_math_single_backslash --output missing-encoding.tex --template "C:UserstriceraflopsDocumentsRwin-library3.4rmarkdownrmdlatexdefault-1.17.0.2.tex" --highlight-style tango --latex-engine pdflatex --variable graphics=yes --variable "geometry:margin=1in" 
output file: missing-encoding.knit.md

Output created: missing-encoding.pdf
Error in tools::file_path_as_absolute(output_file) : 
  file 'missing-encoding.pdf' does not exist
Calls: <Anonymous> -> <Anonymous>
In addition: Warning messages:
1: running command '"pdflatex" -halt-on-error -interaction=batchmode 
"missing-encoding.tex"' had status 1 
2: In readLines(logfile) :
  incomplete final line found on 'missing-encoding.log'
Execution halted

And finally here's the last part of the output log file where it fails.

Now handling font encoding OMX ...
... no UTF-8 mapping file for font encoding OMX
Now handling font encoding U ...
... no UTF-8 mapping file for font encoding U
defining Unicode char U+00A9 (decimal 169)
defining Unicode char U+00AA (decimal 170)
defining Unicode char U+00AE (decimal 174)
defining Unicode char U+00BA (decimal 186)
defining Unicode char U+02C6 (decimal 710)
defining Unicode char U+02DC (decimal 732)
defining Unicode char U+200C (decimal 8204)
defining Unicode char U+2026 (decimal 8230)
defining Unicode char U+2122 (decimal 8482)
defining Unicode char U+2423 (decimal 9251)
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