The xPath query did not return any data. Google Spreadsheets

The xPath query did not return any data. Google Spreadsheets

I am successfully using the following importXML function in one of my
google spreadsheets:
=ImportXML("https://www.iformbuilder.com/exzact/dataXML.php?PAGE_ID=30212&TABLE_NAME=_data13387_behavior_tracker"
& "&USERNAME=" & Config!A1 & "&PASSWORD=" & Config!A2;
"./_data13387_behavior_tracker/record")
When I made a copy of this spreadsheet and changed the above function to
the following to pull in data from a different data set stored at the same
site, I keep getting the following error message: The xPath query did not
return any data.:
=ImportXML("https://www.iformbuilder.com/exzact/dataXML.php?PAGE_ID=2387969&TABLE_NAME=_data13387_behavior_tracker_201314"
& "&USERNAME=" & Config!A1 & "&PASSWORD=" & Config!A2;
"./_data13387_behavior_tracker_201314/record")
I have triple-checked that the new page ID and table name are correct for
the new XML feed. There is data in the new feed. If anyone has any
insight, I'd greatly appreciate it.
Note: I'm a first-time poster so forgive me if I've committed a number of
newbie mistakes with this post. I'm open to feedback.