How to fix "underflow"?

Question

I am using Truffle v5.5.5 and solidity 0.8.0.

I have the following constructor in my contract:

contract rNFT is ERC721Enumerable, Ownable {
  using Strings for uint256;

  string baseURI;
  string public baseExtension = ".json";
  uint256 public cost; // = 0.0 ether;
  uint256 public maxSupply = 999999999999999999;
  uint256 public maxMintAmount = 1;
  bool public paused = false;
  bool public revealed = true;
  string public notRevealedUri;

  constructor(
    string memory _name,
    string memory _symbol,
    string memory _initBaseURI,
    string memory _initNotRevealedUri,
    uint256 _cost
  ) ERC721(_name, _symbol) {
    setBaseURI(_initBaseURI);
    setNotRevealedURI(_initNotRevealedUri);
    setCost(_cost);
  }

So basically the costs can also be set for the contract.

When deploying with truffle I use the following:

var rNFT = artifacts.require("../contracts/rNFT.sol");

module.exports = function(deployer) {
  deployer.deploy(rNFT, "rNFT", "rNFT", "www._initBaseURI.com", "www._initNotRevealedUri.com", 0.12);

};

However, I get the following error:

Error:  *** Deployment Failed ***

"rNFT" -- underflow (fault="underflow", operation="BigNumber.from", value=0.12, code=NUMERIC_FAULT, version=bignumber/5.0.8).

    at /usr/local/lib/node_modules/truffle/build/webpack:/packages/deployer/src/deployment.js:379:1
    at processTicksAndRejections (node:internal/process/task_queues:96:5)
    at Migration._deploy (/usr/local/lib/node_modules/truffle/build/webpack:/packages/migrate/Migration.js:68:1)
    at Migration._load (/usr/local/lib/node_modules/truffle/build/webpack:/packages/migrate/Migration.js:54:1)
    at Migration.run (/usr/local/lib/node_modules/truffle/build/webpack:/packages/migrate/Migration.js:202:1)
    at Object.runMigrations (/usr/local/lib/node_modules/truffle/build/webpack:/packages/migrate/index.js:152:1)
    at Object.runFrom (/usr/local/lib/node_modules/truffle/build/webpack:/packages/migrate/index.js:117:1)
    at Object.run (/usr/local/lib/node_modules/truffle/build/webpack:/packages/migrate/index.js:94:1)
    at runMigrations (/usr/local/lib/node_modules/truffle/build/webpack:/packages/core/lib/commands/migrate/run.js:78:1)
    at Object.module.exports [as run] (/usr/local/lib/node_modules/truffle/build/webpack:/packages/core/lib/commands/migrate/run.js:44:1)
    at Command.run (/usr/local/lib/node_modules/truffle/build/webpack:/packages/core/lib/command.js:189:1)
UnhandledRejections detected
Promise {
  <rejected> Error: underflow (fault="underflow", operation="BigNumber.from", value=0.12, code=NUMERIC_FAULT, version=bignumber/5.0.8)
      at /usr/local/lib/node_modules/truffle/build/webpack:/packages/deployer/src/deployment.js:348:1
      at processTicksAndRejections (node:internal/process/task_queues:96:5)
      at Migration._deploy (/usr/local/lib/node_modules/truffle/build/webpack:/packages/migrate/Migration.js:68:1)
      at Migration._load (/usr/local/lib/node_modules/truffle/build/webpack:/packages/migrate/Migration.js:54:1)
      at Migration.run (/usr/local/lib/node_modules/truffle/build/webpack:/packages/migrate/Migration.js:202:1)
      at Object.runMigrations (/usr/local/lib/node_modules/truffle/build/webpack:/packages/migrate/index.js:152:1)
      at Object.runFrom (/usr/local/lib/node_modules/truffle/build/webpack:/packages/migrate/index.js:117:1)
      at Object.run (/usr/local/lib/node_modules/truffle/build/webpack:/packages/migrate/index.js:94:1)
      at runMigrations (/usr/local/lib/node_modules/truffle/build/webpack:/packages/core/lib/commands/migrate/run.js:78:1)
      at Object.module.exports [as run] (/usr/local/lib/node_modules/truffle/build/webpack:/packages/core/lib/commands/migrate/run.js:44:1)
      at Command.run (/usr/local/lib/node_modules/truffle/build/webpack:/packages/core/lib/command.js:189:1) {
    reason: 'underflow',
    code: 'NUMERIC_FAULT',
    fault: 'underflow',
    operation: 'BigNumber.from',
    value: 0.12,
    hijackedStack: 'Error: underflow (fault="underflow", operation="BigNumber.from", value=0.12, code=NUMERIC_FAULT, version=bignumber/5.0.8)\n' +
      '    at lib_esm_Logger.makeError (/usr/local/lib/node_modules/truffle/build/webpack:/node_modules/@ethersproject/abi/node_modules/@ethersproject/logger/lib.esm/index.js:166:1)\n' +
      '    at lib_esm_Logger.throwError (/usr/local/lib/node_modules/truffle/build/webpack:/node_modules/@ethersproject/abi/node_modules/@ethersproject/logger/lib.esm/index.js:175:1)\n' +
      '    at throwFault (/usr/local/lib/node_modules/truffle/build/webpack:/node_modules/@ethersproject/abi/node_modules/@ethersproject/bignumber/lib.esm/bignumber.js:273:18)\n' +
      '    at Function.from (/usr/local/lib/node_modules/truffle/build/webpack:/node_modules/@ethersproject/abi/node_modules/@ethersproject/bignumber/lib.esm/bignumber.js:175:1)\n' +
      '    at NumberCoder.encode (/usr/local/lib/node_modules/truffle/build/webpack:/node_modules/@ethersproject/abi/lib.esm/coders/number.js:13:17)\n' +
      '    at /usr/local/lib/node_modules/truffle/build/webpack:/node_modules/@ethersproject/abi/lib.esm/coders/array.js:57:1\n' +
      '    at Array.forEach (<anonymous>)\n' +
      '    at pack (/usr/local/lib/node_modules/truffle/build/webpack:/node_modules/@ethersproject/abi/lib.esm/coders/array.js:43:1)\n' +
      '    at TupleCoder.encode (/usr/local/lib/node_modules/truffle/build/webpack:/node_modules/@ethersproject/abi/lib.esm/coders/tuple.js:19:16)\n' +
      '    at AbiCoder.encode (/usr/local/lib/node_modules/truffle/build/webpack:/node_modules/@ethersproject/abi/lib.esm/abi-coder.js:82:1)\n' +
      '    at ABICoder.encodeParameters (/usr/local/lib/node_modules/truffle/build/webpack:/node_modules/web3-eth-abi/lib/index.js:120:1)\n' +
      '    at /usr/local/lib/node_modules/truffle/build/webpack:/node_modules/web3-eth/node_modules/web3-eth-contract/lib/index.js:438:1\n' +
      '    at Array.map (<anonymous>)\n' +
      '    at Object._encodeMethodABI (/usr/local/lib/node_modules/truffle/build/webpack:/node_modules/web3-eth/node_modules/web3-eth-contract/lib/index.js:437:6)\n' +
      '    at /usr/local/lib/node_modules/truffle/build/webpack:/packages/contract/lib/execute.js:275:1\n' +
      '    at processTicksAndRejections (node:internal/process/task_queues:96:5)'

Any suggestions what I am doing wrong? I just want to set the costs for each NFT in the contract.

I appreciate your replies!

Answer 1

deployer.deploy(
    rNFT,
    "rNFT",
    "rNFT",
    "www._initBaseURI.com",
    "www._initNotRevealedUri.com",
    **0.12**
);

you can’t have 0.12, there is no float on EVM

If by 0.12 you meant 0.12 ETH, it should be instead 120000000000000000 (18decimals).

There is a nice wei to ether converter here