Redmine 2.1.2: Error exporting gantt to png

I've just installed Bitnami Redmine 2.1.2 (32bit linux insataller) and tried to export gantt to png but it resulted in "Internal Error". The log error went something like :

Magick::ImageMagickError (UnableToReadFont /opt/redmine-2.1.2-0/common/share/ghostscript/fonts/n019003l.pfb' @ error/annotate.c/RenderFreetype/1120:(null)'): lib/redmine/helpers/gantt.rb:486:in draw' lib/redmine/helpers/gantt.rb:486:into_image' app/controllers/gantts_controller.rb:44:in show' app/controllers/gantts_controller.rb:42:inshow'

I've read some post about error when trying to export gantt to png on Redmine 2.0. It seems to be still happening in 2.1.2. Is this a bug or did I miss something?