Fiscal year period closing voucher and starting new financial year

Dear team,

As per Erpnext documentation, after making the first PCV (period closing voucher) and starting year 2019, if any other transactions has been entered in the closing year(2018), then we just can make another PCV that will only transfer the pending P&L balance into Closing Account Head.
but when making the second PCV, I encountered the following error:

Period Closing Voucher PCE/002: Either debit or credit amount is required for (some expense account name)

Any suggestion is much appreciated

Amjad Qasim