web3 错误：BigNumber 错误：“new BigNumber() 不是基数为 16 的数字：”

Question

I'm trying to make this simple Dapp work where I'm sending the variables nombre and edad to the setInstructor() function and then returned by the getInstructor() function. The problem is that I keep getting BigNumber Error: "new BigNumber() not a base 16 number: . Any thoughts?

Solidity

pragma solidity ^0.4.25;


contract Contrato {

  string fName;
  uint age;

  function setInstructor (string _fName, uint _age){
      fName = _fName;
      age = _age;

  }

  function getInstructor () public constant returns (string, uint){
      return (fName, age);
  }

}

Web3

var Contrato = web3.eth.contract(ABI);
var Contratito = Contrato.at(Address);

$("#button").click(function(){

    Contratito.setInstructor($("#nombre").val(), $("#edad").val(), function(error,result){if (!error) { console.log("bien") } else { console.error(error)}});

    Contratito.getInstructor(function(error,result){ if (!error) { $("#instructor").html(result[0] + " " + result[1])} else {console.error(error)}});

})

Answer 1

I'd start by converting $("#edad").val() to a number rather than the string most likely returned. If that doesn't work I would convert both .val() results to BigNumbers manually with new BigNumber(...) .

Let me know where that leaves us in the comments and hopefully we'll get this fixed quickly!

Answer 2

I had this problem as well, in order to fix it I had to change the network my MetaMask browser extension was using to the one specified in the javascript code. Make sure the contract address is located on the network the MetaMask extension is using. Also you should probably post your Ethereum related questions on the Ethereum stack exchange site to get a quicker response: https://ethereum.stackexchange.com

Answer 3

In my case the problem was related with EVM version being used.

I've to move from the default one ( bizantium ) to explicitly indicate the homestead version and it worked.

But attention homestead is the oldest one so I'm not sure of the implications of my choice. I did not try with other versions because it was a contract for test only purposes.

The command to compile the contract and indicate the EVM version (example):

solc --evm-version <VERSION> contract.sol

Reference: https://solidity.readthedocs.io/en/v0.5.3/using-the-compiler.html#setting-the-evm-version-to-target