AssetConverter command exception

I have a .less file which should be converted to .css when it’s going to be published (using AssetBunldes). but when loading the page, following error happens:

AssetConverter command 'lessc '/home/files/www/ucms/web/assets/3f62d01e/css/rtl.less' '/home/files/www/ucms/web/assets/3f62d01e/css/rtl.css' --no-color --source-map' failed with exit code 1:



the worst part is that there is no description! both STDOUT and STDERR are empty. has anyone experienced this before? any suggestions?

I’m on Ubuntu 14.10 and lessc command is installed and sound.

It was an OS level problem, reinstalled node and lessc packages and everything works fine.