RPA Challenge - Object Cloning DOMXPath property won't show

I'm trying to complete the RPA Challenge : http://rpachallenge.com/
I have the correct XPath query and everything, but I'm having trouble creating an object cloning task with the XPath property.
When I use the Capture button, click on a textbox, and look at its properties, there is no DOMXPath property. All I see is the Path property. I've tried putting the XPath into the Path property but that doesn't work. How can I create an object clone with a DOMXPath property?
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