This error is often seen when a "Direct Queue" is being used and the print job is originating from a client machine which does not provide a StationID for the balance/debit calls being made. I suspect you are using an external Billing Gateway and you most likely have a Billing Script in place where this would need to be configured.
I would recommend contacting Pharos Support with any Billing Scripts in use on the system and a detailed description of the user workflow for a Direct Queue. I would also add where you are seeing this error, such as does it show up on the client or somewhere else.
Pharos Technical Support