Displaying data from an external source

I am having a problem with the tutorial here.
When I am creating my previewing my webpage it says in the in the space where the data should be loaded: _level0.name, _level0.email, _level0.location

When i upload it to my site along with the data.txt it displays “undefined” in each of the spots.

My website is here: Tucker’s World under Contact Me

Can anyone help me?