Troubleshooting ===================================== This page contains some advice about errors and problems commonly encountered during the development of Cookiecutter Django applications. #. If you get the error ``jinja2.exceptions.TemplateSyntaxError: Encountered unknown tag 'now'.`` , please upgrade your cookiecutter version to >= 1.4 (see issue # 528_ ) #. ``project_slug`` must be a valid Python module name or you will have issues on imports. .. _528: https://github.com/pydanny/cookiecutter-django/issues/528#issuecomment-212650373