I'm trying to deploy a token contract and a crowdsale contract via Remix on Ropsten. However I am running into trouble. Below are both of my smart contracts and an explanation of what is happening.


pragma solidity ^0.4.18;

import 'github.com/OpenZeppelin/zeppelin-solidity/contracts/token/ERC20/CappedToken.sol';

contract MyCoin is CappedToken {
    string public name = "MY COIN";
    string public symbol = "MYC";
    uint8 public decimals = 18;
    uint256 public cap = 500000000000000000000000;

    function MyCoin ()



pragma solidity ^0.4.19;

import 'browser/MyCoin.sol';
import 'github.com/OpenZeppelin/zeppelin-solidity/contracts/crowdsale/emission/MintedCrowdsale.sol';

contract MyCoinCrowdsale is MintedCrowdsale {
    function MyCoinCrowdsale
            uint256 _rate,
            address _wallet,
            CappedToken _token
        Crowdsale(_rate, _wallet, _token) {


First I deploy MyCoin.sol via Remix and everything runs smoothly as shown in this txn.

However, when I deploy MyCoinCrowdsale.sol via Remix I get a txn error, which states :

Warning! Error encountered during contract execution [Reverted]

Any help would be greatly appreciated as I am completed stumped.

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You have to understand why it fails at deployement, and for that, you have to inspect the constructor(s).

MintedCrowdsale doesn't have a specific constructor and it inherits of Crowdsale, which has one.

  constructor(uint256 _rate, address _wallet, ERC20 _token) public {
    require(_rate > 0);
    require(_wallet != address(0));
    require(_token != address(0));

    rate = _rate;
    wallet = _wallet;
    token = _token;

You can see the 3 require and it's highly probable that you are passing a wrong value for at least one of these parameters.

  • Yep, figured out that I didn't provide any params to the my crowdsale about 25 secs after I posted my question. – winarama Jun 25 '18 at 14:54

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