DataTierManager.could_not_obtain_connector_binding error says it can't find Connection Factory

Got this error:

[TeiidComponentException]Could not obtain connection factory for model EDG in VDB name= hotrod, version 1
at org.teiid.dqp.internal.process.DataTierManagerImpl.createRequest(DataTierManagerImpl.java:569)
at org.teiid.dqp.internal.process.DataTierManagerImpl.registerRequest(DataTierManagerImpl.java:183

and looking at the code, it appears the source names defined for the model are null or empty. I think the message is alluding to the wrong thing it can't find.