How do I export a R/exams question with a tikzpicture to moodle?

Question

I'm using the Template logic: Interpretation of Logic Gates (Using TikZ) but I get the following error when I tried to export do moodle:

exams2moodle('logic.Rnw',name='TEST')

Erro:  chunk 2 
Error in magick_image_readpath(path, density, depth, strip, defines) : 
  rsession: not authorized `/tmp/RtmptUvxDm/file2d826c1a0925/tex2image/A.pdf' @ error/constitute.c/ReadImage/412