What version are you running? 2.0.12 What's the URL of the page containing the problem? It's a problem with the RBClient package when calling root.get_diff_comments(). What steps will reproduce the problem? 1. Create a review request. 2. Create a review on that review request and open an issue. 3. Use RBClient to try to get the diff_comment for that review in order to get the issue_open_count via root.get_diff_comments(). What is the expected output? What do you see instead? I should only have to provide review_request_id and review_id in order to get to the diff_comment. Instead, I get ValueError: Template was not provided a value for 'reply_id' smacleod says this is because there are diff_comment resources for both reviews and review replies, and that there is only a URI template created for the latter. So there is no direct way to get to the review's diff_comment; instead, I have to get the review and then call get_diff_comments() on the review resource. What operating system are you using? What browser? OS X, Python 2.7.9.