multi-signature

[codes0003]

I need to build a DelegateResource transaction and use multi-signature, please help me correct it

params, err := anypb.New(&core.DelegateResourceContract{
		OwnerAddress:    PublicKeyToAddress(privateKey.PublicKey),
		ReceiverAddress: r,
		Resource:        core.ResourceCode_ENERGY,
		Balance:         3200000000,
		Lock:            false,
		LockPeriod:      50,
	})
	if err != nil {
		return
	}
	multiSigTransaction := &core.Transaction{
		RawData: &core.TransactionRaw{
			Contract: []*core.Transaction_Contract{{
				Type:         core.Transaction_Contract_DelegateResourceContract,
				Parameter:    params,
				PermissionId: 2,
			}},
			
			RefBlockBytes: now.Blockid,
		},
	}
	tx, err := SignTransaction(multiSigTransaction, privateKey)
	if err != nil {
		fmt.Println(err)
	}
	re, err := c.WalletClient.BroadcastTransaction(ctx, multiSigTransaction)
	if err != nil {
		fmt.Println(err)
	}

func SignTransactions(transaction *core.Transaction, privateKey *ecdsa.PrivateKey) (*core.Transaction, error) {
	transaction.GetRawData().Timestamp = time.Now().UnixNano() / 1000000
	rawData, err := proto.Marshal(transaction.GetRawData())
	if err != nil {
		return nil, err
	}
	h256h := sha256.New()
	h256h.Write(rawData)
	hash := h256h.Sum(nil)
	contractList := transaction.GetRawData().GetContract()
	for range contractList {
		signature, err := crypto.Sign(hash, privateKey)
		if err != nil {
			return nil, err
		}
		transaction.Signature = append(transaction.Signature, signature)
	}
	return transaction, nil
}

output

Transaction broadcasted: code:TAPOS_ERROR message:"Tapos check error."