Category "solidity"

I am finding it difficult to initialize package.json file in my truffle project

I can not install package.json dependencies in my truffle project and I have tried touch.json. it's giving me errors. I have also tried truffle init, but it is

python sintax problem for solidity compilator

I have problem connected to python. I want to compile solidity files using python. But getting error. import json from solcx import compile_standard, inst

Command 'Solidity: Compile Contract' resulted in an error (Cannot read properties of undefined(reading 'uri'))

Good day everyone, I am working on a lottery smart contract. I am currently done with the remix VM tests and proceeded with the unit tests with JavaScript. The

ethers can't get pure function return value

I built a test solidity pure function to display a greeting message. It only returns a string "Hello User". Here is the contract code: //SPDX-License-Identifie

Can't verify ERC20/BEP20 token on BSCScan

I deployed an ERC20/BEP20 token on binance smart chain using truffle and openzepplin. Now I want to verify this smart contract but I have some issues. $ truffle

Brownie downloads solc every time I run compile

I'm using Visual Studio Code and every time I run brownie compile I get this which takes a good while (and also I can't compile without internet connection): I

How to set price for all NFTs in a collection on opensea?

If I mint a collection of n items on my own address (via smart contract) , it'll be publicly visible on my account under the collected / created section like th

How to create a simple swapping contract

I want to create a contract that buys and sells to a fixed price which can be set with a contract interaction onlyOwner basically i need a token vendor with edi

Restrict function access ONLY to one other specific contract in Solidity

I have a security problem in my Solidity contracts and I can't figure out how to fix it. The flow goes like this: First, we create an instance of contract A; Cr

Matic Remix Warning! Error encountered during contract execution [execution reverted]

I forked a contract, it is a Baked Beans fork on MATIC, I deployed the contract through Remix, now when I try to deposit through my website script, Metamask say

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

How to send ETH to a contract function with ethers.js?

I am trying to send ETH to a contract function from a web app via metamask and ethers.js. So far I have tried: const provider = new ethers.providers.Web3Provide

The event 'close' is deprecated and may be removed in the future

I want the best method to implement these two lines. Goal: Obtain the object of a smart contract named dev-token. async function ... { ... const web3 =

PancackeswapV2Router swapExactETHForTokensSupportingFeeOnTransferTokens: 'Pancake: TRANSFER_FAILED' when "from" equals to "pancackeSwapV2pair"

PancakeSwap is driving me crazy! I have this simple contract: when the token are transferred from someone different from the owner, instead of making the transe

Contracts do not compile with zksync-solc. Their ABI and bytecode seem to be printed as an error

I am pretty new to development and asking questions on stackoverflow, so if there is something else I could provide, please tell me in comments! I have installe

Getting Promise Object when Calling Solidity Functions

I have a function in my smart contract where I am trying to return some data that has been stored in the blockchain, function showOrg(address org) external

Getting TransferHelper: TRANSFER_FROM_FAILED from TransferHelper.sol. Why?

I'm new to solidity. I'm currently getting the following error TransferHelper: TRANSFER_FROM_FAILED from the safeTransferFrom function. Can someone tell me why?

list all token IDs by owner at ERC721

I have a simple ERC721 smart contract used for testing purposes, I was wondering if it is possible to query the token IDs a specific wallet owns in that smart c

how can i call a function in a smart contract from an abi json file smart contract

i have the abi json file for a contract and i want to use its functions in my smart contract. is there any way to do it? for example i have a contractA.sol and

running into decleration error in solidity course

just started a solidity coding course and ran into this issue with this code: //SPDX-License-Identifier: MIT pragma solidity >=0.6.0; import "./simplestora

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