version 1.18 not knitting to PDF due to ! Undefined control sequence. l.942 \file_get:nnN {unicode-math-table.tex} {} \l__um_mathtable_tl · Issue #1733 · rstudio/rmarkdown · GitHub
r - error in Knitr using the rticles package: ! Undefined control sequence. <recently read> \checkmark - Stack Overflow