Why did all my tansfer dot transaction fail, thank you

[shihuajin111]

const {ApiPromise, WsProvider} = require("@polkadot/api");
const {Keyring} = require("@polkadot/keyring");

async function main() {
const url_data = "wss://rpc.polkadot.io"
const provider = new WsProvider(url_data);
const api = await ApiPromise.create({provider});
const mnemonic = "my owner phrase "
const keyring = new Keyring();
const pair = keyring.createFromUri(mnemonic);

keyring.setSS58Format(0);
console.log('Polkadot', pair.address);
const now = await api.query.timestamp.now();

// Retrieve the account balance & nonce via the system module
const { nonce, data: balance } = await api.query.system.account(pair.address);
console.log(${balance.frozen})
available=${balance.free} -${balance.frozen}
console.log(available)
console.log(${now}: balance of ${balance.free} and a nonce of ${nonce});
if (available > 3204355237){
try {
const txHash = await api.tx.balances
.transferKeepAlive("1FEG5Yni2RQMbccXHsZAEX9X5ZxZhpekNqEjurm9oQ49FvT", 12345)
.signAndSend(pair);

// Show the hash
console.log(Submitted with hash ${txHash});
return
} catch (e) {
console.log(e); // Logs the error
return
}
}
setTimeout(main, 1000);
}
try {
main().catch(console.error);
} catch (e) {
console.log(e); // Logs the error
}

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