Environment
Truffle v5.1.32
Details
I restructured a code base and tried testing the contract with command line truffle test, but I got a compilation error complaining about imported file import “@openzeppelin/contracts/access/Ownable.sol”; from node_modules@opengsn\gsn\contracts\BasePaymaster.sol. I went through the node_modules and I could not find the Ownable,sol file in @openzeppelin/contracts/access/Ownable.sol
Code to reproduce
// SPDX-License-Identifier:MIT
pragma solidity ^0.6.2;
pragma experimental ABIEncoderV2;
import "@openzeppelin/contracts/access/Ownable.sol";
import "./interfaces/IPaymaster.sol";
import "./interfaces/IRelayHub.sol";
1 Like
Hi @Sam-Devs,
That import looks correct. What version of OpenZeppelin Contracts are you using?
The file on GitHub is: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v3.1.0/contracts/access/Ownable.sol
I installed the current version of OpenZeppelin Contracts (v3.1.0) using
npm i @openzeppelin/contracts
I could then compile the following contract:
MyContract.sol
// SPDX-License-Identifier:MIT
pragma solidity ^0.6.2;
pragma experimental ABIEncoderV2;
import "@openzeppelin/contracts/access/Ownable.sol";
contract MyContract is Ownable {
}
I installed @openzeppelin/contracts v2.4.0
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Hi @Sam-Devs,
OpenZeppelin Contracts 2.x uses Solidity 0.5 and has a different directory structure for some contracts. Ownable.sol in 2.x is in an ownership directory.
https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v2.4.0/contracts/ownership/Ownable.sol
Given that you are using Solidity 0.6 in your pragma you should use OpenZeppelin Contracts v3.x which supports Solidity 0.6.
Hi @Sam-Devs,
I just wanted to check that you were able to resolve?
Thank you for reaching out.
I am just reading through your responses now. I will try it out and revert to you.
1 Like
Hi @Sam-Devs,
Just wanted to check if you had any more questions?
1 Like