@openzeppelin/contracts-ethereum-package still referencing @openzeppelin/contracts error

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1

Using Oppenzeppelin version 2.8.2 and truffle version v5.1.26

My contract uses

import "@openzeppelin/contracts-ethereum-package/contracts/access/Ownable.sol";
import "@openzeppelin/contracts-ethereum-package/contracts/utils/ReentrancyGuard.sol";
import "@openzeppelin/contracts-ethereum-package/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts-ethereum-package/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts-ethereum-package/contracts/Initializable.sol";

contract calls

contract EPNSCore is Initializable, OwnableUpgradeSafe, ReentrancyGuardUpgradeSafe {
    using SafeMath for uint256;

    /* ***************
     * CONSTRUCTORS, MODIFIERS AND FUNCTIONS
     *************** */
    function initialize( ) public initializer {

but i still get this error

- Contract EPNSCore or an ancestor has a constructor. Change it to an initializer function. See https://docs.openzeppelin.com/upgrades/2.6//writing-upgradeable#initializers.
- Contract EPNSCore imports access/Ownable.sol, GSN/Context.sol, utils/ReentrancyGuard.sol, math/SafeMath.sol, token/ERC20/IERC20.sol from @openzeppelin/contracts. Use @openzeppelin/contracts-ethereum-package instead. See https://docs.openzeppelin.com/cli/2.6/dependencies#linking-the-contracts-ethereum-package.
One or more contracts have validation errors. Please review the items listed above and fix them, or run this command again with the --force option.
1 Like
2

Hi @Dike_Jude,

I’m sorry that you had this issue. Is your contract importing anything else?

I tried to reproduce using your imports (see MyContract.sol below) but was able to compile:

$ npx oz compile --solc-version 0.6.7
✓ Compiled contracts with solc 0.6.7 (commit.b8d736ae)

MyContract.sol

pragma solidity ^0.6.0;

import "@openzeppelin/contracts-ethereum-package/contracts/access/Ownable.sol";
import "@openzeppelin/contracts-ethereum-package/contracts/utils/ReentrancyGuard.sol";
import "@openzeppelin/contracts-ethereum-package/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts-ethereum-package/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts-ethereum-package/contracts/Initializable.sol";

contract MyContract is Initializable, OwnableUpgradeSafe, ReentrancyGuardUpgradeSafe {
    using SafeMath for uint256;

    /* ***************
     * CONSTRUCTORS, MODIFIERS AND FUNCTIONS
     *************** */
    function initialize( ) public initializer {}
}
3

Hi @abcoathup,
I assumed ‘oz deploy’ compiles and deploys.
Meaning i have to compile first before trying to deploy

1 Like
4

Hi @Dike_Jude,

Apologies, I only did a compile check and didn’t check oz deploy.

Unfortunately I’m not able to reproduce what you are seeing with my simple example.

Are you able to share your contract, or at least all the imports as I suspect that something that you are importing uses a constructor?

$ npx oz deploy
Nothing to compile, all contracts are up to date.
? Choose the kind of deployment upgradeable
? Pick a network development
? Pick a contract to deploy MyContract
✓ Added contract MyContract
✓ Contract MyContract deployed
All implementations have been deployed
? Call a function to initialize the instance after creating it? Yes
? Select which function * initialize()
✓ Setting everything up to create contract instances
✓ Instance created at 0xCfEB869F69431e42cdB54A4F4f105C19C080A601
To upgrade this instance run 'oz upgrade'
0xCfEB869F69431e42cdB54A4F4f105C19C080A601