Why does this error occur? Error when sending a transaction: cannot estimate gas; transaction may fail or may require manual gas limit?

Question

There is enough balance, the network is also working correctly, the keys are also correct, the gas has been increased, but the error remains.

const ethers = require("ethers");
const networkRPC = 'https://eth-sepolia.g.alchemy.com/v2/UfPvcFpj2bEwwTF4OXlEVP4atqGHfgUk';
const senderPrivateKey = '0xa0278f908d619f8967aa252b80679ca5ff2e85b31103dd53741c39780f6717a3';
const recipientAddress = '0xa014da1d3baC8799E78EE5cF87ff2bb105491d28';
const tokenAddress = '0x91B25A65b295F0405552A4bbB77879ab5e38166c';
const amountToSend = "0.000001"; // Указывайте в токенах, которые будут конвертированы в Wei
const provider = new ethers.providers.JsonRpcProvider(networkRPC);
const senderWallet = new ethers.Wallet(senderPrivateKey, provider);
const tokenABI = [
    "function balanceOf(address owner) view returns (uint256)",
    "function transfer(address to, uint amount) returns (bool)"
];
const tokenContract = new ethers.Contract(tokenAddress, tokenABI, senderWallet);
async function sendSWAN() {
    try {
        const amountInWei = ethers.utils.parseUnits(amountToSend, 18);
    // Проверка баланса перед отправкой
    const senderBalance = await tokenContract.balanceOf(senderWallet.address);
    if (senderBalance.lt(amountInWei)) {
        console.error("Недостаточно средств для отправки");
        return;
    }

    // Фиксированные значения газа и цены газа
    const gasLimit = ethers.BigNumber.from("2100000");
    const gasPrice = ethers.BigNumber.from("8000000000");

    // Отправка транзакции
    const transaction = await tokenContract.transfer(recipientAddress, amountInWei, {
        gasLimit: gasLimit,
        gasPrice: gasPrice
    });

    console.log(`Транзакция отправлена: ${transaction.hash}`);
    const receipt = await transaction.wait();
    console.log(`Транзакция успешно выполнена в блоке ${receipt.blockNumber}`);
} catch (error) {
    console.error(`Ошибка при отправке транзакции: ${error.message}`);
}

}
sendSWAN().catch(console.error);