Hi, I got a compilation error while doing npx oz compile and the error is @openzeppelin/contracts/ownership/Ownable.sol:3:1: ParserError: Source "@openzeppelin/contracts/GSN/Context.sol" not found: File import callback not supported import "../GSN/Context.sol"; And this is my simple smart contract, pragma solidity ^0.5.0; import "@openzeppelin/contracts/ownership/Ownable.sol"; contract Storage is Ownable { uint256 private value; function setValue(uint256 _value) public onlyOwner { value = _value; } function getValue() public returns (uint256) { return value; } } I don’t know which part of the import statement is wrong. Is it in my contract or in openzeppelin’s one of the contracts? Any help would be appreciated :slight_smile:

Hi @manolingam, Sorry to hear you are having an issue. The import appears ok. What version of OpenZeppelin Contracts are you using? What operating system and versions of node and npm?

Hi @abcoathup, Am using OpenZeppelin Contracts v2.5.0 on a Windows machine with node v12.16.0 and npm v6.13.0.

Hey @manolingam. I’ve just compiled your contract. It works fine. Do you compile with openzeppelin or truffle? Which versions do you use? What is your truffle.js or network.js file?

I suggest looking at using WSL (this is what I use) [image] Solidity Smart Contract development on Windows Guides and Tutorials There are two main options to setup our environment for Solidity Smart Contract development on Windows. The Microsoft recommendation is to use Windows Subsystem for Linux. https://docs.microsoft.com/en-us/windows/nodejs/setup-on-windows#use-windows-subsystem-for-linux-for-production Many Node.js packages and frameworks are created with a *nix environment in mind and most Node.js apps are deployed on Linux, so developing on WSL ensures consistency between your development and production envir…

Hello @ylv-io, I compiled with openzeppelin and the command-line version is 2.7.2. And here’s my network.js file, module.exports = { networks: { development: { protocol: 'http', host: 'localhost', port: 8545, gas: 5000000, gasPrice: 5e9, networkId: '*', }, }, }; I don’t know why I can’t compile. Getting the same error again.

Hello @abcoathup, I wanna use windows as my main development environment as I usually find it difficult to create a subsystem and manage resources for it. Hope someone helps me with the issue. And thanks for the suggestion anyways :slight_smile:

Used your version still works fine for me. Which version of @openzeppelin/contracts": "^2.5.0" you use? What is inside of .openzeppelin/project.json? Which version of solc compiler it tries to use? ompiled contracts with solc 0.5.16 (commit.9c3226ce) for me.

Hi @ylv-io and @manolingam, The issue appears to be developing natively with Windows. I vaguely remember (two years ago) having to swap the from / to \ in import statements though I haven’t been able to find any documentation on this. I’m running Windows Subsystem for Linux with no issues. I unfortunately don’t have a pure Windows environment that I can use to reproduce at the moment. An alternative for experimentation is to use Remix with GitHub imports (see Deploy a simple ERC20 token in Remix) In production the Windows recommendation is to use Windows Subsystem for Linux. (see https://docs.microsoft.com/en-us/windows/nodejs/setup-on-windows#use-windows-subsystem-for-linux-for-production)

Hello @ylv-io, Are you using windows? Also, I have attached below some screenshots for your reference. [Screenshot (32)] [Screenshot (34)] Thanks for your response too @abcoathup. Since Igor can compile successfully in his environment, I wanna know what went wrong in mine. So, I would use Windows Subsystem as a secondary environment.

Hey @manolingam. You setup is perfectly valid. Unfortunately at that moment we don’t support windows as a platform directly. Your options would be to try Windows Subsystem for Linux or other platforms. I am sorry for inconvenience.

Compilation error in OpenZeppelin Contracts on Windows

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Compilation error in OpenZeppelin Contracts on Windows

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