TemplateSyntaxError

[nicopace]

Hi Guys,
I'm having this error when running the example app:
'crowdsourcing' is not a valid tag library: ImportError raised loading crowdsourcing.templatetags.crowdsourcing: No module named helpers

Here is the dpaste of the error:
http://dpaste.com/hold/1564643/

The steps to reproduce the error are these:

mkvirtualenv --python=python2.7
wget https://github.com/wnyc/django-crowdsourcing/archive/master.zip
unzip master.zip
cd django-crowdsourcing-master/example_app
pip install -r ../crowdsourcing_requirements.txt
pip install -r example_app_requirements.txt
pip install Django==1.4.3
./manage.py syncdb
./manage.py runserver
# Load one survey, with one question
# Access that survey