Hi Brandi,
Thank you for contacting Clarizen Support.
Since the code of this application includes Parent of task, it throws an error, as there is no Parent for TO-DO tasks ( http://screencast.com/t/D0urnC15). I would recommend tweaking the rule if you would like to run it on floating tasks. See this article: https://clarizen.zendesk.com/entries/25247508.
For further clarification, we suggest you register for one of our Advanced Q&A webinars (see the link-> http://www.clarizen.com/resources/online-demo.html#second ).These are great resources for free consulting with our Customer Success Managers and visual answers to your questions. Please ask for a demo and we will walk you through this.
All the best,
Diana