failing script without rvm use default

gistfile1.rb

# From: http://beginrescueend.com/workflow/scripting/
# Load RVM into a shell session *as a function*
if [[ -s "$HOME/.rvm/scripts/rvm" ]] ; then

  # First try to load from a user install
  source "$HOME/.rvm/scripts/rvm"

elif [[ -s "/usr/local/rvm/scripts/rvm" ]] ; then

  # Then try to load from a root install
  source "/usr/local/rvm/scripts/rvm"

else

  printf "ERROR: An RVM installation was not found.\n"

fi

export RAILS_ENV=production

cd $APP_PATH

rvm use default # <= fails without this
bundle exec rake do_something