Overpayment letter from the unemployment office after 12 years as a quality inspector

I received a letter saying I was overpaid about $1150 on my claim. There are 12 people counting on me, so I am trying to be careful. The letter mentions an appeal window and a repayment plan. Are payment plans possible?

Collect your pay stubs and certification records for the weeks they name. Mine showed the error was a date mix-up.