Gas required exceeds allowance when deploying a contract

Question

I try to deploy a contract using truffle to my private ethereum network using geth and i get this error gas required exceeds allowance (6721975) or always failing transaction. I have create an account and i have mined with this. I also have connected it with metamask. What i have to do to solve it?

genesis.json

{
"config": {
"chainId": 15,
"homesteadBlock": 0,
"eip155Block": 0,
"eip158Block": 0
},
"nonce": "0x0000000000000042",
"mixhash":
"0x0000000000000000000000000000000000000000000000000000000000000000",
"difficulty": "0x200",
"alloc": {},
"coinbase": "0x0000000000000000000000000000000000000000",
"timestamp": "0x00",
"parentHash":
"0x0000000000000000000000000000000000000000000000000000000000000000",
"gasLimit": "0xffffffff",
"alloc": {
}
}

contract

pragma solidity 0.5.8;

contract Creation {
    // Model a Candidate
    struct Candidate {
        uint id;
        string name;
        uint voteCount;
    }

    // Store accounts that have voted
    mapping(address => bool) public voters;
    // Store Candidates
    // Fetch Candidate
    mapping(uint => Candidate) public candidates;
    // Store Candidates Count
    uint public candidatesCount;

    // voted event
    event votedEvent (
        uint indexed _candidateId
    );

    constructor () public {
        addCandidate("Candidate 1");
        addCandidate("Candidate 2");
    }

    function addCandidate (string memory  _name) private {
        candidatesCount ++;
        candidates[candidatesCount] = Candidate(candidatesCount, _name, 0);
    }

    function vote (uint _candidateId) public {
        // require that they haven't voted before
        require(!voters[msg.sender]);

        // require a valid candidate
        require(_candidateId > 0 && _candidateId <= candidatesCount);

        // record that voter has voted
        voters[msg.sender] = true;

        // update candidate vote Count
        candidates[_candidateId].voteCount ++;

        // trigger voted event
        emit votedEvent(_candidateId);
    }
}

Answer 1

Having the max gas consumed usually means that the contract construction function throws or reverts. But the question does not have enough details to tell.

Maybe you can edit the question and add your contract code and what commands you use to deploy it.

Answer 2

Finally i have to write in the web3provider "localhost:port" and not the ip of my node