I was trying to find out why your Simple Children macro wanted for Root Page (and why it didn't seem to accept a page from another space)
But then your documentation at http://www.brikit.com/display/help/Simple+Childrensays it takes no parameters whatsoever:
This is a minor issue with Confluence. I believe it relates to Confluence no longer storing the space key, which is why you see "Not Found" eventhough the space and page exist. If you use the refresh button within the macro window, your pagetree should appear.
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