Why are you using setup_frappe.sh script to setup your bench? Please use following guide
# Linux:
wget https://raw.githubusercontent.com/frappe/bench/master/playbooks/install.py
# Mac OSX:
# install X Code (from App store)
# install HomeBrew (http://brew.sh/)
brew install python
brew install git
curl "https://raw.githubusercontent.com/frappe/bench/master/playbooks/install.py" -o install.py
# For development
sudo python install.py --develop
# For production
sudo python install.py --production
# If you are logged in as root, use "--user" flag to create a user and install using that user
'sudo python install.py --develop --user frappe'