Can't import openzeppelin node_modules: File import callback not supported

user_12209110 0
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Whenever I try to compile my solidity contract, the error ParserError: Source \"@OpenZeppelin/contracts/math/SafeMath.sol\" not found: File import callback not supported gets thrown.

pragma solidity ^0.7.0;

import "@OpenZeppelin/contracts/token/ERC20/ERC20.sol";
import "@OpenZeppelin/contracts/math/SafeMath.sol";

Any ideas what could be causing this?

openzeppelin solidity node.js
8 Answers

Make sure you opened VS Code in the root directory of the project.

In my case, this is how my VS Code directory looked like when I get that same error.

projects
 |___MyContract
   |__contracts
     |__Contract.sol

Reopening VS Code in the MyContract directory fixes it.

MyContract
 |__contracts
   |__Contract.sol
user_40462450

I have the same problem right now. I'm using truffle+node and I fixed it modifying the import path to a relative path, for example,

pragma solidity ^0.7.0;

import "../node_modules/OpenZeppelin/contracts/token/ERC20/ERC20.sol";
import "../node_modules/OpenZeppelin/contracts/math/SafeMath.sol";

I'm not 100% sure why this happen but I hope I helped you.

user_151259440

After installing OpenZeppelin close your IDE and re-open it.

user_56979920

For some environments, SafeMath has a different path

import "@openzeppelin/contracts/utils/math/SafeMath.sol";
user_93089090

Make sure you installed openzeppelin

npm install --save @openzeppelin/contracts@v3.0.0
user_117376730

actualy the problem is solidity compiler is stupid and doesn't automatically follow path, you have to specify all allowed path manually (https://docs.soliditylang.org/en/latest/using-the-compiler.html), every each one of them and completely to the file(cannot give juste the higher level folder) use npx hardat compile if you can it's better

user_97371400

what worked for me; (I am using Windows10 and visual studio code) -click on the extensions icon -search for the solidity extension -select the uninstall button and click on the drop down arrow -select install another version -select version 0.0.135 -After the installation, click on "Reload required"

user_184083820

This worked for me -

Change the settings in Solidity extension in VSCode.

The default settings include: "solidity.packageDefaultDependenciesContractsDirectory": "contracts" Users need to change the setting from contracts to an empty string. "solidity.packageDefaultDependenciesContractsDirectory": ""

Source - https://github.com/juanfranblanco/vscode-solidity/issues/178

user_50280030
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