Migration Error: The requested contract was not found.

[boyuanx]

I've never had a problem with Truffle upgrades until my current project. Migration gives the following error:
Error: The requested contract was not found. Make sure the source code is available for compilation

Things I've tried:

• Deleting build folder
• Deleting the local repo and cloning again
• Re-adding truffle-upgrades plugin
• Making sure the plugins are of the latest version

I've tried looking up this issue online and none of the posts helped. Need urgent help on this as this is blocking our entire project. Thanks!

[ericglau]

Can you share a repo where we can reproduce the issue? Which versions of Truffle, NodeJS, and truffle-upgrades plugin are you using?

[boyuanx]

Yes - do I share it with you? @ericglau

It's private so I cannot share it in public.

[ericglau]

@boyuanx You can share it with me and I'll take a look.

[boyuanx]

@ericglau invited, it's the revamp branch.

[ericglau]

I was able to reproduce the issue. Looking into it.

[ericglau]

@boyuanx I've identified the problem in the upgrades plugin where contracts are ignored if multiple parent contracts have the same name.

In this case, this happens because a contract imports @openzeppelin/contracts-upgradeable/interfaces/IERC20Upgradeable.sol which imports @openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol. We should fix the plugin to detect this situation.

As a workaround for now, you can change the following line in your contract:

import "@openzeppelin/contracts-upgradeable/interfaces/IERC20Upgradeable.sol";

to

import "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";

[boyuanx]

@ericglau Thank you!

[ericglau]

Minimal example to reproduce this issue:

Contract:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "@openzeppelin/contracts-upgradeable/interfaces/IERC20Upgradeable.sol";
contract ImportIERC20  {
}

Migration:

const { deployProxy } = require("@openzeppelin/truffle-upgrades");
const ImportIERC20 = artifacts.require("ImportIERC20");
module.exports = async function (deployer) {
  await deployProxy(ImportIERC20, { deployer });
};

[ericglau]

@boyuanx As this issue can be reproduced with my comment above, please go ahead and remove me from your repo. Thank you for bringing this to our attention.

[boyuanx]

Appreciate the quick response!

[adeebabdulsalam]

@ericglau I had this same issue with hardhat plugin.

steps to reproduce

in contracts directory
-> contractA.sol (name: A)
-> contractB.sol

interface A { ////}
contract B {  uses interface A }

solution:
changed the name of interface to IA in contractB.sol