This occurs when a French/Foreign character was used in the invoice or any record related to the invoice. (i.e. Customer, Shipper/Consignee, Order, Trip/Contract, etc.)
We suggest doing the export in small chunks until you can find the invoice that caused the error.
Once you have located the invoice that won’t transfer you should open it and any records related to it in Fleet/Logistics Manager to find the character. Once the character is found it should be removed/replaced and the invoice will transfer.
Alternatively, you can manually enter the invoice if you cannot find the character that is preventing it from importing.