Tranfert transaction issue

[clementjuventin]

Hi guys,
First of all, thanks for developing an aptos sdk in golang. It really helps people like me :)

I ran into a problem while trying to do a simple transfer.
Here is my code...

func transfert(from utils.Account, to utils.Account, aptosValue uint64) error {
	accountInfo, err := aptosClient.GetAccount(ctx, from.Address)
	if err != nil {
		return err
	}
	addr, _ := models.HexToAccountAddress(to.Address)

	tx := models.Transaction{}
	err = tx.SetChainID(settings.ChainID).
		SetSender(from.Address).
		SetPayload(getTransferPayload(addr, aptosValue*settings.AptosUnit)).
		SetExpirationTimestampSecs(uint64(time.Now().Add(10 * time.Minute).Unix())).
		SetGasUnitPrice(settings.GasPrice).
		SetMaxGasAmount(uint64(settings.MaxGasPrice)).
		SetSequenceNumber(accountInfo.SequenceNumber).Error()
	if err != nil {
		return err
	}

	msgBytes, err := tx.GetSigningMessage()
	if err != nil {
		panic(err)
	}

	var pk1, _ = hex.DecodeString(from.PrivateKeyHex[2:])
	priv1 := ed25519.NewKeyFromSeed(pk1)
	signature := ed25519.Sign(priv1, msgBytes)
	var authErr = tx.SetAuthenticator(models.TransactionAuthenticatorEd25519{
		PublicKey: priv1.Public().(ed25519.PublicKey),
		Signature: signature,
	}).Error()
	if authErr != nil {
		panic(authErr)
	}
	rawTx, err := aptosClient.SubmitTransaction(ctx, tx.UserTransaction)
	if err != nil {
		panic(err)
	}

	utils.Log(utils.Info, 0, "Transfert 1 APTOS from "+from.Address+" to "+to.Address+" TX: "+rawTx.Hash)
	return nil
}

func getTransferPayload(to models.AccountAddress, amount uint64) models.TransactionPayload {
	return models.EntryFunctionPayload{
		Module: models.Module{
			Address: addr0x1,
			Name:    "coin",
		},
		Function:      "transfer",
		TypeArguments: []models.TypeTag{aptosCoinTypeTag},
		Arguments:     []interface{}{to, amount},
	}
}

As you can see, it is strongly inspired by your example script. The problem is that this part of the code triggers an error :

	msgBytes, err := tx.GetSigningMessage()
	if err != nil {
		panic(err)
	}

Output : panic: non-optional enum value is nil

I don't see what my script is missing to make it work. I hope you can help me understand the problem if there is one. Thanks in advance.

[Kumazan]

Is aptosCoinTypeTag initialized?