Category "openzeppelin"

Solidity library @openzeppelin/contracts/access/Ownable.sol is not resolving ownerOnly()

I am trying to switch my contract to use the 'import "@openzeppelin/contracts/access/Ownable.sol”’, but I am getting the following error contracts/I

Error: VM Exception while processing transaction: reverted with reason string 'ERC721: transfer caller is not owner nor approved'

i try to write NFT marketplace and i have problem with reselling items from user that buy item from owner and new, third user. I use next.js + openzeppelin + ha

Trying to run a Brownie Dapp in Docker

I'm trying to run my brownie dapp in a docker container, but i always have the same error and can't seem to fix it: FileNotFoundError: [Errno 2] No such file or

totalsupply() is not a function openzeppelin contracts

I'm trying to import some contract files from open zeppelin so my solidity smart contracts can inherit their functionality, when trying to write chai tests that

Source "@openzeppelin/contracts/token/ERC721/ERC721.sol" not found: File import callback not supported

I've imported the Open Zeppelin ERC721 token standard into my VS Code with the Solidity extension, but see the following warnings on all my OZ import statements

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

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

Error when trying to deploy standard OpenZeppelin ERC777 contract to ganache-cli using the brownie framework

I am familiarizing myself with smart contract development using the brownie framework and solidity. To start of I was using the brownie console to deploy some s

not found utils/context.sol when i import from openzepplin

i have copied a contract from openzappline. but when i compile it on remix it gives me the error....that utils/context.sol is not found. here is the import prag

Ethernaut challenge -Lv22 Dex - allowance approval problem

I'm trying to complete the Dex level of ethernaut challenge which is quite easy. In order to use swap I need firstly to approve token allowance, but I don't und

Error in plugin @nomiclabs/hardhat-etherscan: The contract verification failed. Reason: Fail - Unable to verify - with arguments

I am trying to verify my contract with arguments and I am getting this error: Error in plugin @nomiclabs/hardhat-etherscan: The contract verification failed. Re

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