RELAYER_SIGNATURE_PRESENT

The transaction already had a relayerSignature.

HTTP status	400
Group	Relay path
Retryable	No — sending it again changes nothing
Re-sign	NONE — do not ask the user to sign anything

What happened

The relayer signature is ours to add. A transaction that arrives with one cannot be co-signed.

What to do

Remove relayerSignature and send the transaction with only the sender (and guardian) signature.

The problem document

Every error is application/problem+json (RFC 9457) with the same shape:

{
  "type": "https://docs.co-relayer.com/errors/relayer-signature-present",
  "title": "The transaction already had a `relayerSignature`.",
  "status": 400,
  "detail": "A sentence about this specific occurrence.",
  "instance": "req_01JB…",
  "code": "RELAYER_SIGNATURE_PRESENT",
  "retryable": false,
  "resign": "NONE",
  "hint": "Remove `relayerSignature` and send the transaction with only the sender (and guardian) signature."
}

See the error model for what each member means and how to handle unknown codes.