錯誤 HH600：編譯失敗 ParserError：應為“，”但得到“；”

當我在執行 yarn hardhat compile 時遇到此錯誤時，我正在學習 chainlink hackton 課程“DeFi Staking App: Code Again”連結：

ParserError: 應為 ‘,’ 但得到 ‘;’ –> 合約/Staking.sol:59:24: | 59 | 過去的獎勵；| ^

錯誤 HH600：編譯失敗

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.7;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

error Staking__TransferFailed();
error Stakig__NeedsMoteThanZero();


contract Staking {
   IERC20 public s_stakingToken;
   ERC20 public s_rewardToken;
   // somones address -> how much they staked
   mapping(address => uint256) public s_balances;

  // mapping of how much each address has been paid
  mapping(address => uint256) public s_userRewardPerTokenPaid;

  // a mapping of how much rewards each address has to claim
  mapping(address => uint256) public s_rewards;

uint256 public constant REWARD_RATE =100;
uint256 public s_totalSupply;
uint256 public s_rewardPerTokenStored;
uint256 public s_lastUpdateTime;

modifier updateReward(address account){
   s_rewardPerTokenStored = rewardPerToken();
   s_lasrUpdateTime = block.timestamp;
   s_rewards[account] = earned(account);
   s_userRewardPerTokenPaid[account] = s_rewardPerTokenStored;
   _;
}

modifier moreThanZero(uint256 amount){
   if( amount ==0){
       revert Stakig__NeedsMoteThanZero();
   }
   _;

}
   


constructor(address stakingToken, address rewardToken) {
   s_stakingToken = IER20(stakingToken);
   s_rewardToken = IER20(rewardToken);
}

function earned(address account) public view returns (uint256){
   uint256 currentBlanace = s_balances[account];
   // how much they have paid alredy
   uint256 amountPaid = s_userRewardPerToken[account];
   uint256 currentRewardPerToken = rewardPerToken();
   uint256 pastRewards = s_rewards[account];
   uint256 _earned = ((currentBalance *(currentRewardPerToken - amountPaid)/1e18) + 
       pastRewards;
   return _earned; 

}



function rewardPerToken public view returns(uint256) {
   if (s_totalSupply ==0){
       return s_rewardPerTokenStored;
   }
   return s_rewardPerTokenStored + (((block.timestamp -s_lastUpdateTime) * REWARD_RATE * 1e18/ s_totalSupply);
}

function stake(uint256 amount) external updateReward(msg.sender) moreThanZero(amount) {
   s_balances[msg.sender] = s_balances[msg.sender] + amount;
   s_totalSupply = s_totalSupply + amount;
   // emit event
   bool success = s_stakingToken.transferFrom(msg.sender, address(this), amount);
   // require(success, "Failed");
   if(!success) {
       revert Staking__TransferFailed();
   }

}

}

function withdraw(uint256 amount) external updateReward(msg.sender) moreThanZero(amount) {
   s_balances[msg.sender] = s_balances[msg.sender] - amount;
   s_totalSupply = s_totalSupply - amount; 
   bool success = s_stakingToken.transfer(msg.sender, amount);
   if(!success) {
       revert Staking__TransferFailed();
   }

}

function claimReward() external updateReward(msg.sender) {
   uint256 reward = s_rewards[msg.sender];
   bool succes = s_rewardToken.transfer(msg.sender, reward);
   if(!success){
       revert Staking__TransferFailed();
   }
   

}
 

}

這裡：

function rewardPerToken public view returns(uint256) {
   if (s_totalSupply ==0){
       return s_rewardPerTokenStored;
   }
   return s_rewardPerTokenStored + (((block.timestamp -s_lastUpdateTime) *     REWARD_RATE * 1e18/ s_totalSupply);
}

你忘記了函式括號。它應該看起來像function rewardPerToken()

引用自：https://ethereum.stackexchange.com/questions/127764