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当我尝试在 vscode 中运行以下代码时出现此错误（ (node:64344) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'hash' of undefined），我不明白该怎么做。我一直在谷歌上搜索，但没有找到答案。所以现在我在这里尝试

const lib = require('xrpl-accountlib')
const { XrplClient } = require('xrpl-client')

const secret = 's--'
const account = 'a---' // Can be derived

const client = new XrplClient('wss://s1.ripple.com')
const keypair = lib.derive.familySeed(secret)

const main = async () => {
  console.log('Getting ready...')
  const { account_data } = await client.send({ command: 'account_info', account })
    console.log(account_data.Sequence);
  const tx = {
    "TransactionType": "TrustSet",
    "Account": account,
    "Fee": "12",
    "Flags": 262144,
    "LastLedgerSequence": 8007750,
    "LimitAmount": {
      "currency": "TET",
      "issuer": "a--",
      "value": "100"
    },
    "Sequence": account.Sequence
}

  const {signedTransaction} = lib.sign(tx, keypair)
  const submit = await client.send({ command: 'submit', 'tx_blob': signedTransaction })
  console.log(submit.engine_result, submit.engine_result_message, submit.tx_json.hash)
  console.log(submit)
  client.close()
}

main()

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