@mrhutchinsonmn , we just recently had the exact same problem. It all about versions of files. I don't know if the MySensors library version is critical. But the external examples libraries were the key for us. In the Demonstration section of the project it says:
NOTE: The code referenced in this video is out of date. Please use the code below with the current MySensors library and the libraries included in the MySensors external examples. Please install the libraries and restart the Arduino IDE before trying to compile.
In that Examples library referenced, you need the version of the Liquid Crystal library. That version defines POSITIVE and hopefully will get you to compile successfully.
