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my smart contract cause error : out of gas error


By : Анна Ладорная
Date : October 17 2020, 06:10 AM
this one helps. It appears that your smart contract requires more gas (fees) to execute than the default amount. You have to increase the gasLimit and gasPrice from their default values. You can specify them in hex like this.
code :
Courses.fireDonation(document.getElementById('contributor').value, {from: web3.eth.accounts[2], value: amount, gasLimit: '0x27100', gasPrice: '0x09184e72a00'});


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Error sending value to Ethereum smart contract


By : José Luis Martin
Date : March 29 2020, 07:55 AM
should help you out From Solidity 0.4 onwards:

error in smart contract indicate haven't unique attribute.


By : user1376469
Date : March 29 2020, 07:55 AM
this will help You misspelled "complains" when you declared your struct. (You spelled it "compalins" there.) So the error on the mapping line is that there's no such identifier "complains". If you fix the typo, the code will compile.

How to solve the error when deploying a smart contract in Ethereum?


By : user14817
Date : March 29 2020, 07:55 AM
it fixes the issue Please be sure to read the solc docs for solc v0.5.0+ to ensure you're adjusting for the changes to the Solidity compiler.
Something like this should be compatible with the latest version of solc:
code :
// Note: You should be defining your contract sources as objects now.
// Note: You must also provide the compiler output selection as well.
const compilerInput = {
    language: "Solidity",
    sources: {
        'Voter': { content: fs.readFileSync('Voter.sol', 'utf8') }
    },
    settings: {
      outputSelection: {
        "*": {
          "*": [ "abi", "evm.bytecode" ]
        }
      }
    }
};

console.log('Compiling the contract')
// Note: You have to pass the input in with JSON.stringify now.
const compiledContract = JSON.parse(solc.compile(JSON.stringify(compilerInput)));

if(compiledContract.errors) {
    compiledContract.errors.forEach(err => console.log(err.formattedMessage));
}

// Note: This changed slightly since I'm using JSON.parse above.
const contract = compiledContract.contracts['Voter'].Voter; // Voter contract from Voter file.

// Note: This is now called 'abi' and not 'interface'
const abi = contract.abi;
fs.writeFileSync('abi.json', JSON.stringify(abi, null, 2));
async function deployContract(web3, contract, sender) {
    let Voter = new web3.eth.Contract(JSON.parse(JSON.stringify(abi)));
    let bytecode = '0x' + contract.evm.bytecode.object;
    let gasEstimate = await web3.eth.estimateGas({data: bytecode});

    // The rest should work fine...
}

I am trying to test this liquidity smart contract code but if shows error. Liquidity is similar to ocaml, tezos's smart


By : Vinay Kalal
Date : March 29 2020, 07:55 AM
this one helps. I have been trying to test the first entry point of this game which is play. But when it tries to compile it, there's some error showing. How do I proceed or is there something I am missing? , You forgot to initialize, add this code:
code :
let%init storage (oracle_id : address) =
  {game = (None : game option); oracle_id}

Node error when I deployed smart contract - Web3.js


By : user3236151
Date : March 29 2020, 07:55 AM
should help you out Before using an address to send a transaction, make sure you have added it to your web3 wallet.
Guide: https://web3js.readthedocs.io/en/v1.2.0/web3-eth-accounts.html#wallet-add
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