Cannot call method "getAllVmFolders" of null

Hello All,

I have a vRO action generates a dynamic dropdown list using a script I found here:  http://2vsteaks.com/use-dynamic-populated-drop-list-vra-7-default-iaas-blueprints/.  Using these instructions, I created the vRO action without issue and then set up a property definition in my vRA blueprint to point to that action.  When I try to run the blueprint, though, I get the following error:

I am using not sure where to go at this point to troubleshoot the issue.  Can anyone offer any assistance?  I have attached relevant portion of the /var/log/vco/app-server/server.log file.

Thanks,

Ann