If you have received an 'Error #3159. DAO. Recordset. Not a valid bookmark' error when importing payments, you will need to download the file again and try re-importing.
If downloading the file has not worked, run a Repair and Compact.
If the issue persists, please email firstname.lastname@example.org, advising that you have tried downloading the file again and run the repair and compact, to no avail.