Revert Error When Using Truffle Console

External question — Ethereum Stack Exchange Author: jamaal Original post: https://ethereum.stackexchange.com/questions/112553 License: CC BY-SA 4.0 — https://creativecommons.org/licenses/by-sa/4.0/ Adaptation: HTML converted to plain text; contact email addresses removed. I'm working on a smart contract and when I try to call my contract methods from the truffle console, I am getting a revert error. I can't figure out why this is happening. The contract is deployed to a local ganache network and the smart contract and revert error below. Any insight on this is very appreciated. pragma solidity ^0.8.0; import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol"; import "@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol"; import "@openzeppelin/contracts/access/Ownable.sol"; import "@openzeppelin/contracts/utils/math/SafeMath.sol"; contract FloodFill is ERC721Enumerable, Ownable { uint256 public maxTokens; mapping(string => string) private tokenColor; constructor(string memory name, string memory symbol, uint256 maxNftSupply) ERC721(name, symbol) { maxTokens = maxNftSupply; } function setTokenColor(string memory tokeId, string memory color) public onlyOwner{ tokenColor[tokeId] = color; } function returnTokenColor(string memory tokeId) public view returns (string memory){ return tokenColor[tokeId]; } } I get a revert error when I try to call either method. In my full contract, I have no problem calling the other contract methods. The specific error I get with the following truffle console command is below truffle console> instance.setTokenColor('1a', 'blue', {from: accounts[0]}) Uncaught Error: Returned error: VM Exception while processing transaction: revert at evalmachine.<anonymous>:0:10 at sigintHandlersWrap (vm.js:274:12) at Script.runInContext (vm.js:142:14) at runScript (/usr/local/lib/node_modules/truffle/build/webpack:/packages/core/lib/console.js:364:1) at Console.interpret (/usr/local/lib/node_modules/truffle/build/webpack:/packages/core/lib/console.js:379:1) at bound (domain.js:416:15) at REPLServer.runBound [as eval] (domain.js:427:12) at REPLServer.onLine (repl.js:819:10) at REPLServer.emit (events.js:375:28) at REPLServer.emit (domain.js:470:12) at REPLServer.Interface._onLine (readline.js:364:10) at REPLServer.Interface._line (readline.js:700:8) at REPLServer.Interface._ttyWrite (readline.js:1045:14) at REPLServer.self._ttyWrite (repl.js:912:9) { data: { '0xfef3a53aba0054d8577d992d87fbbdbc8f981847079fc8cfbd059c214ee130e6': { error: 'revert', program_counter: 466, return: '0x' }, stack: 'RuntimeError: VM Exception while processing transaction: revert\n' + ' at Function.RuntimeError.fromResults (/Applications/Ganache.app/Contents/Resources/static/node/node_modules/ganache-core/lib/utils/runtimeerror.js:94:13)\n' + ' at BlockchainDouble.processBlock (/Applications/Ganache.app/Contents/Resources/static/node/node_modules/ganache-core/lib/blockchain_double.js:627:24)\n' + ' at runMicrotasks (<anonymous>)\n' + ' at processTicksAndRejections (internal/process/task_queues.js:93:5)', name: 'RuntimeError' }, hijackedStack: 'Error: Returned error: VM Exception while processing transaction: revert\n' + ' at Object.ErrorResponse (/usr/local/lib/node_modules/truffle/build/webpack:/node_modules/web3-core-helpers/lib/errors.js:28:1)\n' + ' at /usr/local/lib/node_modules/truffle/build/webpack:/node_modules/web3/node_modules/web3-core-requestmanager/lib/index.js:302:1\n' + ' at /usr/local/lib/node_modules/truffle/build/webpack:/packages/provider/wrapper.js:107:1\n' + ' at XMLHttpRequest.request.onreadystatechange (/usr/local/lib/node_modules/truffle/build/webpack:/node_modules/web3/node_modules/web3-providers-http/lib/index.js:98:1)\n' + ' at XMLHttpRequestEventTarget.dispatchEvent (/usr/local/lib/node_modules/truffle/build/webpack:/node_modules/xhr2-cookies/dist/xml-http-request-event-target.js:34:1)\n' + ' at XMLHttpRequest.exports.modules.996763.XMLHttpRequest._setReadyState (/usr/local/lib/node_modules/truffle/build/webpack:/node_modules/xhr2-cookies/dist/xml-http-request.js:208:1)\n' + ' at XMLHttpRequest.exports.modules.996763.XMLHttpRequest._onHttpResponseEnd (/usr/local/lib/node_modules/truffle/build/webpack:/node_modules/xhr2-cookies/dist/xml-http-request.js:318:1)\n' + ' at IncomingMessage.<anonymous> (/usr/local/lib/node_modules/truffle/build/webpack:/node_modules/xhr2-cookies/dist/xml-http-request.js:289:47)\n' + ' at IncomingMessage.emit (events.js:387:35)\n' + ' at IncomingMessage.emit (domain.js:532:15)\n' + ' at endReadableNT (internal/streams/readable.js:1317:12)\n' + ' at processTicksAndRejections (internal/process/task_queues.js:82:21)' }

External answer — Ethereum Stack Exchange Author: santamanno Original post: https://ethereum.stackexchange.com/a/113464 License: CC BY-SA 4.0 — https://creativecommons.org/licenses/by-sa/4.0/ Adaptation: HTML converted to plain text; contact email addresses removed. Not sure it may help you, but I'm getting the same when the sender is not the owner, and I see you have the "onlyOwner" modifier on your function. Can you try and remove the modifier and see if the transaction goes through? (or make sure you're calling the contract from the actual owner address?).