Error syncing the data between the BillQuick and Quickbooks

Hello Tech savvy,
When I am in the process of syncing the data between the BillQuick and Quickbooks, I am getting this odd error message. The error says it cannot transfer to Quickbooks. When I look BQQBLog for more details, I cannot find relevant information there. How do I resolve this error? Please help me. Thanks in advance.

There were 1 BillQuick Payment(s) that did transfer because the associated invoice(s) are not in QuickBooks.
Please see the “BQQBLog” file for additional details.
