我正在使用AWS在Nodejs中构建REST API。我期待着Postman的回应，说“

Your Bid Must Be Higher than ${auction.highestBid.amount}

“但是，我在Postman上收到了内部服务器错误，AWS Cloudwatch上的错误如下所示：enter image description here。但是，我在Postman上发送请求，地址为：enter image description here请帮助！！
我期待的回应是：你的出价必须高于

${auction.highestBid.amount}

修补程序请求主体如下所示：enter image description here创建请求如下所示：enter image description here
//placeBid.js

const AWS = require('aws-sdk');
const createError = require('http-errors');
const {getAuctionById} = require('./getAuction');

const dynamodb = new AWS.DynamoDB.DocumentClient();
async function placeBid(req) {

  const { id } = req.pathParameters;
  const { amount } = JSON.parse(req.body);
  const auction = getAuctionById(id);
  if(amount <= auction.highestBid.amount)
  throw new createError.Forbidden(`Your Bid Must Be Higher than ${auction.highestBid.amount}`);

  const params = {
    TableName: 'AuctionsTable',
    Key : {id},
    UpdateExpression : 'set highestBid.amount = :amount',
    ExpressionAttributeValues: {
      ':amount' : amount
    },
    ReturnValues : 'ALL_NEW'
  }

  let updatedAuction;
  try {
    const result = await dynamodb.update(params).promise();
    updatedAuction = result.Attributes;
  } catch (error) {
    console.error(error);
    throw new createError.InternalServerError(error);
  }

  return{
    statusCode : 200,
    body : JSON.stringify(updatedAuction)
  }
}

module.exports.handler = placeBid;

//getAuction.js

const AWS = require('aws-sdk');
    const createError = require('http-errors');
    
    const dynamodb = new AWS.DynamoDB.DocumentClient();
    
    module.exports.getAuctionById = async(id) => {
      let auction;
      try {
        const result = await dynamodb.get({
          TableName : 'AuctionsTable',
          Key : {id}
        }).promise()
        auction = result.Item;
    
      } catch (error) {
        console.error(error);
        throw new createError.InternalServerError(error);
      }
      if(!auction){
        throw new createError.NotFound(`Auction with ID ${id} not found`);
      }
      return auction;
    }
    
    async function getAuction(req) {
      const { id } = req.pathParameters;
      const auction = await getAuctionById(id);
      return{
        statusCode : 200,
        body : JSON.stringify(auction)
      }
    }
    
    module.exports.handler = getAuction