Unable to transfer 1 ether

Question

I want to write a function let user deposit 1 eth to a specific address for registering purpose.

pragma solidity ^0.5.0;

contract Election {
    mapping(uint => UserRequest) public userRequest;
    // chairman account, let airline deposit to become a member
    address payable chairman;

    // Constructor
    constructor () public payable {
        chairman = msg.sender;
    }

    function register() public payable{
        chairman.transfer(1 ether);
    }
}

While I test the register() on the remix, the following error threw out.

transact to Election.register errored: VM error: revert. revert The transaction has been reverted to the initial state. Note: The constructor should be payable if you send value. Debug the transaction to get more information.

Some solution I found said I need to deploy it with a certain value, but what does that mean?

Answer 1

As pointed by @goodvibration, it's probably trying to transfer 1 ether to the chairman, regardless of the amount the user sent to the contract when calling register.

If an user needs to send at least 1 ether everytime he calls this function, and you want to be sure of it, you can add a require statement and check the msg.value, like that :

    function register() public payable{
        require(msg.value >= 1 ether);
        chairman.transfer(1 ether);
    }