I am encountering this error while deploying my smart contract on the Ganache blockchain, can anyone help me fix it?

Error:  *** Deployment Failed ***

"Coffee" hit an invalid opcode while deploying. Try:
 * Verifying that your constructor params satisfy all assert conditions.
 * Verifying your constructor code doesn't access an array 
 * List item

I deployed it on the test net and it showed no error, but when I deployed it on Ganache, it returned this error.

this is my deployment script

var MyContract = artifacts.require("coffee");

module.exports = function (deployer) {

this is my contract

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract CoffeePurchase {
    address public owner;
    mapping(address => string) private messages;
    struct purchase {
        string from;
        string to;
        address addFrom;
        address addTo;
    purchase[] public purchases;
    event PurchaseMade(address indexed buyer, uint256 amount, string message);

    constructor() {
        owner = msg.sender;

    modifier onlyOwner() {
        require(msg.sender == owner, "Only the owner can access this function");

    function purchaseCoffee(string calldata _from,string calldata _to,address _addTo,string memory message) public payable {
        require(msg.value > 0, "Coffee price must be greater than 0 wei");
        messages[_addTo] = message;
        emit PurchaseMade(msg.sender, msg.value, message);
    function showDetails() external view returns(purchase[] memory){
        return purchases;
    function getMessage() public view returns (string memory) {
        return messages[msg.sender];

    function withdrawFunds() public onlyOwner {
  • Which version of Solidity? Which network fork in Ganache?
    – ceseshi
    Aug 16, 2023 at 20:09
  • Please provide your contract code inside your question body, as well as your deploy script.
    – Rohan Nero
    Aug 16, 2023 at 21:38
  • 1
    @ceseshi i am using solc version0.8.13 and network fork london Aug 17, 2023 at 12:44
  • Note to anyone trying to answer: The contract compiles and deploys on Remix while using 0.8.13 solidity and on London fork.
    – Rohan Nero
    Aug 17, 2023 at 21:37

1 Answer 1


I had the same problem and it's solved by doing the following..!

Go to truffle-config.js and change the solc version to "0.8.0" or "0.8.2" (both worked fine for me)

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