What this means: Two or more records in your file share the same National Insurance number. Jarvis needs each person to appear only once per submission.
Why this might happen: Your payroll export may include multiple lines per worker (e.g. spanning more than one pay period), or there's a data entry error where two workers share the same NI number.
What to do
Search your file for duplicate NI numbers (
NationalInsuranceNumberin PAPDIS,NI Numberin NEST,NINOin NOW:Pensions)If the same worker appears multiple times, adjust your export so each person is listed once per submission
If different workers share an NI number, correct the data in your payroll system
Re-export and resubmit