未捕获（承诺）TypeError：无法读取未定义的属性“ startsWith”

Question

在NuxtJS项目中，无法在for循环内调用智能合约函数。每当我尝试在for循环外调用时，效果都很好。我在做什么错了？

let listOf = this.contract
const contractAddress = await this.cont.methods.contracts(2).call({
  from: this.ethAddress
})
console.log("contract address in 2 index " + contractAddress) // it worrks
await this.contract.methods.getContractcount().call({
    from: this.ethAddress
  },
  function (error, result) {
    if (!error) {

      var log = result
      console.log(log)
      var ContractList = async (log) => {
        for (var i = 0; i < log; i++) {
          console.log("==== " + i)


          await listOf.methods.contracts(i).call({
              from: this.ethAddress
            })
            .then(function (result) {
              console.log(result) // it says error
            });
        }
      }
      ContractList(log)
    } else {
      console.log(error)
    }
  })

我的控制台错误

8d1bc033c0b40cc14af6.js:2 Uncaught (in promise) TypeError: Cannot read property 'startsWith' of undefined
at Function.t.fromHexString (8d1bc033c0b40cc14af6.js:2)
at t._callStaticAsync (8d1bc033c0b40cc14af6.js:2)
at t.<anonymous> (8d1bc033c0b40cc14af6.js:2)
at 8d1bc033c0b40cc14af6.js:2
at Object.next (8d1bc033c0b40cc14af6.js:2)
at 8d1bc033c0b40cc14af6.js:2
at new Promise (<anonymous>)
at Module.y (8d1bc033c0b40cc14af6.js:2)
at t._ethCall (8d1bc033c0b40cc14af6.js:2)
at t.<anonymous> (8d1bc033c0b40cc14af6.js:2)