This error message originates from Twinfield. When a processed booking appears under export errors with this message, it means that one of the following dimensions is no longer present in the relevant administration in Twinfield: creditor, debtor, general ledger account, project, and/or cost center.
Consult Twinfield to check whether the dimension still needs to be created. It is possible that it has been created but is currently hidden. In Twinfield you can configure it to be visible again.