I get the same thing ctpoole gets. You place a node because validator says you need a node, then you hit save and it throws an error for having the node. It's a vicious cycle.
I have been doing cleanup with Validator in low traffic areas. Per the Wiki I have been adding the node to these scenarios and have not received errors on save for the most part. There have been a couple of occasions where there was a loop that would cause some errors and I would need to build out a section at a time, but never an error when adding the extra node.