Transaction failed to sanitize accounts offsets correctly

[oriana13]

Good morning ! First of all thank you very much for this project! But I have a small question, I wanted to test a transaction but it sends me an error, I don't know where it can come from, can you help me? Thank you :)

package org.p2p.solanaj;

import java.nio.charset.StandardCharsets;

import org.p2p.solanaj.core.Account;
import org.p2p.solanaj.core.PublicKey;
import org.p2p.solanaj.core.Transaction;
import org.p2p.solanaj.programs.SystemProgram;
import org.p2p.solanaj.rpc.Cluster;
import org.p2p.solanaj.rpc.RpcClient;

public class app {
    public static void main(String[] args) throws Exception {
        RpcClient client = new RpcClient(Cluster.TESTNET);

        PublicKey fromPublicKey = new PublicKey("7qZdRkPfAXr8dya3Ui5zaMNVR1u5yScTYC2nrU4zoqhq");
        PublicKey toPublickKey = new PublicKey("CagvN2fgcgWBCSYZ7UgdeY7Rx7vMRj3tacBiCEuU8wPc");
        int lamports = 1000;

        String sKey = "*****************************************************************";
        byte[] secret = sKey.getBytes(StandardCharsets.UTF_8);

        Account signer = new Account(secret);

        Transaction transaction = new Transaction()
                .addInstruction(SystemProgram.transfer(fromPublicKey, toPublickKey, lamports));

        String signature = client.getApi().sendTransaction(transaction, signer);

        System.out.println(signature);
    }

}