Solana wallet-adapterで「RPC Error: Transaction creation failed」エラー

現象

solana-labs/wallet-adapter の「Quick Setup (using React UI) 」を実装すると以下のエラーが発生。

Phantomで実行した場合：

Phantom - RPC Error: Transaction creation failed. {code: -32003, message: 'Transaction creation failed.'}

Solflareで実行した場合：

failed to send transaction: Transaction simulation failed: Transaction leaves an account with a lower balance than rent-exempt minimum

原因

送金額が小さすぎるため。
ガイドのとおり実装すると、最小単位のSOL（0.000000001SOL）を送金になる。金額が小さすぎてトランザクションシミュレーションが失敗してエラーになる。

対応

送金額を増やす。

変更前：

import { WalletNotConnectedError } from '@solana/wallet-adapter-base';
import { useConnection, useWallet } from '@solana/wallet-adapter-react';
import { Keypair, SystemProgram, Transaction } from '@solana/web3.js';
import React, { FC, useCallback } from 'react';

export const SendOneLamportToRandomAddress: FC = () => {
    const { connection } = useConnection();
    const { publicKey, sendTransaction } = useWallet();

    const onClick = useCallback(async () => {
        if (!publicKey) throw new WalletNotConnectedError();

        const transaction = new Transaction().add(
            SystemProgram.transfer({
                fromPubkey: publicKey,
                toPubkey: Keypair.generate().publicKey,
                lamports: 1,
            })
        );

        const signature = await sendTransaction(transaction, connection);

        await connection.confirmTransaction(signature, 'processed');
    }, [publicKey, sendTransaction, connection]);

    return (
        <button onClick={onClick} disabled={!publicKey}>
            Send 1 lamport to a random address!
        </button>
    );
};

引用元：Usage

変更後（transactionのlamportsを変更）：

import { WalletNotConnectedError } from '@solana/wallet-adapter-base';
import { useConnection, useWallet } from '@solana/wallet-adapter-react';
import { Keypair, SystemProgram, Transaction, LAMPORTS_PER_SOL } from '@solana/web3.js';
import React, { FC, useCallback } from 'react';

export const SendOneLamportToRandomAddress: FC = () => {
    const { connection } = useConnection();
    const { publicKey, sendTransaction } = useWallet();

    const onClick = useCallback(async () => {
        if (!publicKey) throw new WalletNotConnectedError();

        const transaction = new Transaction().add(
            SystemProgram.transfer({
                fromPubkey: publicKey,
                toPubkey: Keypair.generate().publicKey,
                lamports: LAMPORTS_PER_SOL * 0.1,
            })
        );

        const signature = await sendTransaction(transaction, connection);

        await connection.confirmTransaction(signature, 'processed');
    }, [publicKey, sendTransaction, connection]);

    return (
        <button onClick={onClick} disabled={!publicKey}>
            Send 1 lamport to a random address!
        </button>
    );
};

参考

ちゃんと送金できる完成版のソースコードを以下に設置した。

GitHub - phantom_send 256hax