This thread at least started talking abut the Tesla mobile charger (i.e. AC charging). Confirm you are using an adapter for NACS to J1772 and not NACS to CCS-1.
Yeah, I'm using J1772 adapters and it is charging just fine after that initial charging error, it's just that the error is annoying and I was curious if others were seeing the same thing.If that were happening, it would never charge from the Mobile Connector.