render from jupyterhub does not work

[pe...@balek.name]

I have problem with render function from jupyterhub.

When I call directly with R from command line - like 

R -e 'rmarkdown::render("/tmp/test_rmarkdown.Rmd", output_file="minimal_output.html", output_dir="/tmp", clean=FALSE, quiet=FALSE, intermediates_dir="/tmp")'

or works fine. In output directory exists all files:

test_rmarkdown.knit.md

test_rmarkdown.utf8.md

minimal_output.html

When I try to run same command from R kernel from Jupyterhub, calls produce only one file

test_rmarkdown.knit.md

No errors in jupetyrhub.log

Do you have any idea why ?

Thank you

Petr