solidity

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Error encountered during Ethereum solidity NFT contract execution [Out of gas]?
user_88219940
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nft smartcontracts solidity ethereum
TypeError: Cannot read properties of undefined (checkUpkeep, chainlink keepers)
user_192917040
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chainlink-keepers chainlink solidity ethereum javascript
Passing a Smart Contract Function Parameter Derived from a Struct to Its Interaction Script
user_196510730
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107
smartcontracts solidity struct javascript
Unsupported method: eth_sendTransaction. Alchemy does not hold users' private keys
user_196507720
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289
alchemy hardhat solidity javascript
How can I read smart contract mapping in my frontend with ethers js?
user_150326770
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ethers.js smartcontracts solidity javascript
I have mapping on my smart contract from unit256 to a struct of different data , need faster way to fetch all the data?
user_184018190
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39
solidity next.js reactjs javascript
why exactly should we use memory or calldata for arrays ,strings, and structs in a function
user_140959410
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blockchain smartcontracts solidity ethereum
"TypeError : Cannot read property 'address' of undefined" i receive this error after lunch the deploy in the testnet, but in localhost works
user_140611510
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61
ethers.js hardhat solidity javascript
Web3J | Source "@openzeppelin/contracts/token/ERC721/ERC721.sol" not found: File not found
user_177559240
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web3-java solidity ethereum java
Error on flash loan contract testing it on Kovan when increasing the amount of the lend
user_3684530
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102
remix solidity ethereum
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