类型错误：变量查找后找不到匹配的声明

如何解决类型错误：变量查找后找不到匹配的声明

我正在 solidity 中编写一个简单的房地产智能合约，在 Truffle 中进行测试时，我不断收到此错误。 “类型错误：变量查找后未找到匹配的声明”。目标是让卖家成为唯一确定房屋价格的人。

这是合同代码供您参考。

pragma solidity ^0.5.16;


contract HomeSale {

    address payable _buyerAddress;
    address payable _seller;
    address payable _agent;

    struct Home{
        uint _priceinBUSD;
        address _owner;
        bool _homeforsale;

    }

    Home[1] HomeDB;

    modifier onlySeller() {
        require [msg.sender == _seller];
        _;
    }
    // set price of house

    function price(uint8 _home,uint256 _priceinBUSD) onlySeller public returns (uint64){
        require(msg.sender);
        HomeDB[_home].priceinBUSD;
    }

    function getPriceofHouse(uint8 _home,uint256 _priceinBUSD) public payable returns(uint256) {
      return HomeDB[_home].priceinBUSD;
    }

    // buyer purchase home

    function buyAHome(uint8 _home) public payable returns(uint256) {
       _buyerAddress = msg.sender;

        //correct home price
        if (msg.value ==HomeDB[_home].priceinBUSD)(_home);

            uint256 finalSalePrice = msg.value/HomeDB(_home).priceinBUSD;

            _seller.transfer(msg.value);
            _agent.transfer(msg.value/100);
            return finalSalePrice;

    }

}

这是我的测试文件：

const HomeSaleTest = artifacts.require("HomeSale");

/*
 * uncomment accounts to access the test accounts made available by the
 * Ethereum client
 * See docs: https://www.trufflesuite.com/docs/truffle/testing/writing-tests-in-javascript
 */
contract("HomeSale",function (accounts) {

  let instance;
  beforeEach('should setup the contract instance',async () => {
    instance = await HomeSale.deployed();
  });


  it("should return the list of accounts",async ()=> {
    console.log(accounts);
  });


  it("should return price",async () => {
    const value = await instance.getPriceofHouse();


    assert.equal(value,'10000')
    });
});