Following the earlier post POPLA have confirmed that this message is a teething problem with the new system, and is on the list to be corrected.
Essentially this message means that the operator has not provided an evidence pack and the motorist will therefore eventually win the appeal. Cases are dealt with in chronological order, so this will happen once the case gets to the top of the pile.
The motorist involved is therefore a happy bunny, apart from having to go through the rigmarole of a POPLA appeal when the operator clearly thought there was no point in contesting it.
The Parking Prankster