TypeError：無法讀取未定義的屬性“：Lottery.sol”。請幫助解決這個問題！

我是新手，剛剛開始建立契約。我收到此契約的此錯誤。請幫助解決這個問題

程式碼-

對於compile.js

const path = require('path');
const fs = require('fs');
const solc = require('solc');



const lotteryPath = path.resolve(__dirname, 'contracts', 'Lottery.sol');
const source = fs.readFileSync(lotteryPath, 'utf-8');

module.exports = solc.compile(source,1).contracts[':Lottery'];

彩票.sol

pragma solidity ^0.4.25; 


contract Lottery{
   address public manager;
   address[] public players;
   
   function lottery() public{
       manager = msg.sender;
   }
   
   function enter() public payable{
       require(msg.value > 0.01 ether);
       
       players.push(msg.sender);
   }
   
   function random() private view returns (uint){
       return uint(keccak256(block.difficulty, now, players));
   }
   
   function pickWinner() public restricted{
       
       uint index = random() % players.length;
       players[index].transfer(this.balance);
       players = new address[](0);
   }
   
   modifier restricted(){
       require(msg.sender == manager);
       _;
   }
   
   function getPlayers() public view returns (address[] memory){
       return players;
   }
}

遇到同樣的問題，試試這個：

代替：

module.exports = solc.compile(source, 1).contracts[‘:Lottery’];

做這個：

compiledContracts = solc.compile(source, 1).contracts;
extractedLottery = compiledCon[:Lottery];
module.exports = extractedLottery;

引用自：https://ethereum.stackexchange.com/questions/87662