看来订单或签署交易的过程可能存在问题. 确保你正确地构建了交易，然后签署了序列化交易. 以下是可能会有所帮助的示例代码：

async function signSerializedTransaction({
  signer,
  serializedTransaction,
}: {
  signer: Keypair;
  serializedTransaction: string;
}) {
  const txBytes = fromB64(serializedTransaction);
  const signatureWithBytes = await signer.signTransaction(txBytes);

  return signatureWithBytes.signature;
}

async function run() {
  const client = new SuiClient({ url: FULLNODE_URL });
  const tx = ...;

  ...

  tx.setSender(USER_KEYPAIR.toSuiAddress());

  tx.setGasOwner(SPONS_KEYPAIR.toSuiAddress());

  const txBytes = await tx.build({ client });
  const txSerialized = toB64(txBytes);

  const userSignature = await signSerializedTransaction({
    signer: USER_KEYPAIR,
    serializedTransaction: txSerialized,
  });


  const sponsorSignature = await signSerializedTransaction({
    signer: SPONS_KEYPAIR,
    serializedTransaction: txSerialized,
  });

 
  const resp = await client.executeTransactionBlock({
    transactionBlock: txBytes,
    signature: [userSignature, sponsorSignature],
    options: {
      showObjectChanges: true,
      showEffects: true,
      showBalanceChanges: true,
    },
  });
  console.log(resp);
}

发送交易时，请确保签名得到正确处理且顺序正确. 错误消息表明交易的序列化和签名方式可能存在数据格式问题或通信差距.