If you get this message, it means that when you did your last lot of receipting or presenting, you forgot to change the date back to the date of the end of month, i.e. 31st December and the items have been presented in January.
To Fix: Un-present the items and re-present down using the correct date. Remember all items presented should be using the date of the bank statement they appear on.
The transactions themselves may be the correct date but the Default Present Date as per below needs to be changed back to the last day of the last month.