Using vCO to create a Business Group failing

I'm trying to use the default Create Business group workflow in vCO and I'm getting an error "typeError: Cannot call method "getId" of null (Dynamic Script Module name : createBusinessGroup#3)"

The #3 in the action item is "group.setMachinePrefixId(defaultMachinePrefix.getId());" 

So I'm not too sure what to do.  The input vCACCAFE:MachinePrefix comes up with 0 results when I try to set it, so I'm assuming that's why it's failing.