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

Question

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?

See my solidity `node_module` referencing here https://stackoverflow.com/a/68459731/8534426 — Asolace, Jul 20 '21 at 22:38
Does this answer your question? [File import callback not supported?](https://stackoverflow.com/questions/67321111/file-import-callback-not-supported) — cse, Oct 20 '21 at 07:41
If you read the VS Code extension docs (I am using the extension by Juan Blanco), it has a section about openzepplin. You need to edit your settings and add the following (assuming node_modules is in the root dir of your ptoject) : "solidity.packageDefaultDependenciesContractsDirectory": "", "solidity.packageDefaultDependenciesDirectory": "node_modules" — Amarsh, Nov 15 '21 at 23:35

score 9 · Answer 1 · answered Sep 02 '21 at 07:03

9

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

answered Sep 02 '21 at 07:03

Chan Jing Hong

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This fixed it for me, was using a project cloned from github. – djd Feb 06 '22 at 18:35

score 8 · Answer 2 · answered Feb 01 '21 at 21:26

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.

score 8 · Answer 3 · answered Jul 19 '21 at 14:34

8

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

answered Jul 19 '21 at 14:34

Leon Africa

509
6
11

You're right, hahaha. The Solidity plugin for VSCode is to blame, I suppose. I edit: the annoying error didn't go away. – Jose4Linux Jul 27 '21 at 22:35
@Jose4Linux make sure the import path is correct – Leon Africa Jul 29 '21 at 17:56

score 2 · Answer 4 · answered May 10 '21 at 11:57

2

For some environments, SafeMath has a different path

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

answered May 10 '21 at 11:57

Radical Ed

178
2
13

This was the solution for me. – Donovan May 08 '22 at 04:27

score 1 · Answer 5 · answered Mar 08 '22 at 13:04

1

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"

answered Mar 08 '22 at 13:04

Ibrahim Onuche Umar

11
2

As it’s currently written, your answer is unclear. Please [edit] to add additional details that will help others understand how this addresses the question asked. You can find more information on how to write good answers [in the help center](/help/how-to-answer). – Community Mar 08 '22 at 13:48
I had a similar bug with version 0.0.163 installed and switching to a previous version fixed the issue(I switched to v0.0.153). – Alon Ben Yaakov Jun 12 '23 at 11:03

score 1 · Answer 6 · edited Apr 07 '22 at 06:03

1

Make sure you installed openzeppelin

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

edited Apr 07 '22 at 06:03

Henry Ecker

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answered Apr 07 '22 at 05:22

surepalli mahesh

11
1

score 0 · Answer 7 · answered Jun 04 '21 at 23:23

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

score 0 · Answer 8 · answered May 01 '22 at 16:53

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

score 0 · Answer 9 · edited Feb 15 '23 at 18:55

0

Try this:

import "{Project Name}/node_modules/@openzeppelin/contracts/token/ERC20/ERC20.sol";

edited Feb 15 '23 at 18:55

Tyler2P

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answered Feb 12 '23 at 16:30

Abhijeet Singh

1

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

9 Answers9