Year-End Processing cannot proceed because no transactions are recorded in Period 12. The closing period is set to 12, but entries only exist from Periods 1 to 11. To address the error and successfully run the Year-End Process:
Add a double entry with an amount of 0.00 in period 12.
E.g.: Debit Bank 0.00 and Credit Capital 0.00.Save Transaction.
Run Year-End Processing.