Views mashup based on Zacker vid

Hello,

I've gotten far enough with the gmap module that I have the user map working:

http://beta.makeworkpay.com/map/user

But I'm having trouble implementing a mashup like a video I found (http://www.zacker.org/screencast-drupal-mashup-machine). He was using Drupal 4.7, I'm using 5.3, so there were a few differences in setup.

My mashup uses a custom content type, I used node import to pull information in from some maps created with MapBuilder.net in the past. Here's where I'm at currently:

http://beta.makeworkpay.com/gmap

I'm assuming the warning means that it's trying to iterate over an empty array. (warning: Invalid argument supplied for foreach() in /var/www/drupal-5.3/sites/all/modules/gmap/gmap_views.module on line 110.) Here's what my view edit screen and node edit screens look like:

http://beta.makeworkpay.com/sites/beta.makeworkpay.com/files/edit_view_g...

http://beta.makeworkpay.com/sites/beta.makeworkpay.com/files/custom_node...

Can anyone offer advice? Can I provide anything else that may help diagnose?

Thank You,
Troy