Error when running heroku command

[djtal]

Hi,

Thanks for this buildpack. I v' got some errors when trying to run the heroku command inside a script.
Here's the traclog of the error

/app/vendor/heroku-toolbelt/lib/heroku/updater.rb:178:in `spawn': No such file or directory - heroku update (Errno::ENOENT)
    from /app/vendor/heroku-toolbelt/lib/heroku/updater.rb:178:in `background_update!'
    from /app/vendor/heroku-toolbelt/lib/heroku/updater.rb:159:in `inject_libpath'
    from /app/vendor/heroku-toolbelt/bin/heroku:19:in `<main>'

The script which is responsible for the error is here. This is a simple script to automate backup of pg database.
PS: in case I've also patched it to avoid the unavailable jarcommand in the cedar-14 stack

Let me know if a better solution exist at this time or you have any hint about solving this error.

Thanks