已经使用Geth搭建私有链，连接matemask，使用remix部署好智能合约。 智能合约（remix）代码片段：

    // 注册新用户
    function register(string memory _username, bytes32 _passwordHash) public {
        require(usernameToId[_username] == 0, "Username already exists");

        // 分配新ID，并立即递增以备下次使用
        uint256 newId = currentId++;

        // 创建新用户
        User memory newUser = User({
            username: _username,
            passwordHash: _passwordHash,
            id: newId
        });

        // 在映射中存储新用户和用户名到ID的映射
        users[newId] = newUser;
        usernameToId[_username] = newId;

        // 触发事件
        emit UserRegistered(newId, _username);
    }

    // 用户登录
    // 此函数现在返回用户的ID和密码的哈希，而不是验证密码
    function login(string memory _username) public view returns (uint256 userId, bytes32 passwordHash) {
        userId = usernameToId[_username];
        require(userId != 0, "User does not exist");
        passwordHash = users[userId].passwordHash;
    }

web3.py部分片段：

tx_hash_register = user_management.register_user("user1", "user1pass", from_address, private_key)
print(f"Transaction hash (register): {tx_hash_register}")
time.sleep(3)
# 获取交易收据
tx_receipt = user_management.w3.eth.get_transaction_receipt(tx_hash_register)
# 检查状态字段以确认交易是否成功
if tx_receipt is not None and tx_receipt.status == 1:
    print(f"Transaction {tx_hash_register} was successful.")
else:
    print(f"Transaction {tx_hash_register} failed or is pending.")
username = "user1"
if user_management.user_exists(username):
    print(f"User {username} exists.")
else:
    print(f"User {username} does not exist or another error occurred.")

执行结果： Transaction hash (register): 0xd09f279169969791e08f7cdf10f896fe5d7bed6e4ce326cfd79e16948e8a2cd9 Transaction 0xd09f279169969791e08f7cdf10f896fe5d7bed6e4ce326cfd79e16948e8a2cd9 was successful. An exception occurred: Could not transact with/call contract function, is contract deployed correctly and chain synced? User user1 does not exist or another error occurred. 可以正确调用智能合约的register()，且成功创建区块存储信息，但是却无法调用login()。错误信息为：An exception occurred: Could not transact with/call contract function, is contract deployed correctly and chain synced? 请问各位有什么解决方法。