I got this message, how can I fixt it?

We can't save this record because the “Opportunity - Set contracted checkbox at Close/Won” process failed. Give your Salesforce admin these details. This error occurred when the flow tried to update records: FIELD_CUSTOM_VALIDATION_EXCEPTION: You cannot update a Closed opportunity. Please reach out to Sales Operations. (Message 6). You can look up ExceptionCode values in the SOAP API Developer Guide. Error ID: 947061604-44277 (-183323947)