Problem about ParserError: Source "@openzeppelin/contracts/token/ERC20/ERC20.sol" not found: File not found. Searched the following locations: ""

Question

// contracts/OurToken.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";

contract OurToken is ERC20 {
constructor(uint256 initialSupply) ERC20("tkname", "tkn") {
    _mint(msg.sender, initialSupply);
    }
 }

this are my helpful-scripts py

dependencies:
  - OpenZeppelin/[email protected]
compiler:
  solc:
    remappinigs:
      - '@openzeppelin=OpenZeppelin/openzeppelin-co[email protected]'
dotenv: .env
wallets:
  from_key: ${PRIVATE_KEY}

error ParserError: Source "@openzeppelin/contracts/token/ERC20/ERC20.sol" not found: File not found. Searched the following locations: "". --> contracts/OurToken.sol:5:1: | 5 | import "@openzeppelin/contracts/token/ERC20/ERC20.sol"; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Answer 1

seems like you are simply just missing to install the OpenZeppelin library in your project. To fix the issue, you can simply run the following command

npm install @openzeppelin/contracts

Try to check whether you can find any @openzeppelin folder under node_modules. If there is, then the import should not fail.

Hope this helps~

Answer 2

Brownie Solution

You can double check that the package is installed using brownie pm list. The output will look something like this:

OpenZeppelin
 ├─OpenZeppelin/[email protected]

If its not installed, you can run the following command in the terminal:

brownie pm install OpenZeppelin/[email protected]

Read more about the package manager command here.