I'm using the build a dashboard video to try and get the mango javascript API example to work. All the rest of the examples in the "custom dashboards" work. including the REST API examples.

but, i cant get the demoVideoExampleCode to work. I've tried to enter the data points manually and using the demoMangoConfig.json in the private folder.
here is the tutorial I'm following:
http://infiniteautomation.com/wiki/doku.php?id=graphics:api:dashboardcreation

here is what I'm seeing in my browser... what could I be doing wrong? The temperature and voltage variables have values.