The number of parameters for transfer's transaction must be 4

[ProDog]

At:

neo-modules/src/RpcClient/Nep17API.cs

Line 113 in 8403137

byte[] script = data is null ? scriptHash.MakeScript("transfer", sender, to, amount) : scriptHash.MakeScript("transfer", sender, to, amount, data);

and

neo-modules/src/RpcClient/Nep17API.cs

Line 140 in 8403137

byte[] script = data is null ? scriptHash.MakeScript("transfer", sender, to, amount) : scriptHash.MakeScript("transfer", sender, to, amount, data);

The number of parameters is 3 if the data is null.