I have been using the Children Display macro successfully and it has suddenly stopped working when I select a specific parent page.
It is currently working if use it "out of the box" and don't reference a different page than I am currently editing. i.e. it works if I want to list the child pages for the page I am currently working on, but it does not work if I select a different page to be the parent page. This is the error I am receiving:
It is also working for a different parent page that I had input a few weeks ago. But anything that I add new results in this error.