My suggestion:
- copy the Report.tex template from my github to your working directory (or someplace else, and use the full path; working directory makes debugging easier)
- in the YAML heading of your .Rmd file include this reference:
output:
pdf_document:
latex_engine: xelatex
template: Report.tex
The indentations are important.
- then run your script again; it should not fail on
\begin{tabu}
, since package tabu is attached in my template.