The Account Data Upload (ADU) Error is "UL123". This actual error is "The total pledge amount for batch &1 ($&2) does not equal the sum of the batch items ($&3)."
Error "UL123" means that a Batch Trailer does not match the actual data in the batch. Find which batch has an incorrect Batch_Trailer (the text at the end of the ADU upload file containing the totals/number of records, etc.) and fix it.