Ethereum: TransactionRevertInstructionError: Transaction was reversed by EVM

Ethereum Transaction RevertInstructionError: Transaction was reverted by EVM

I encountered an error when trying to use addLiquidity with Uniswap V2 on SEOlia testnet using web3.js on Truffle. The error is caused by a transaction being reverted by the Ethereum Virtual Machine (EVM). Here is a detailed explanation of the issue and possible solutions.

The issue:

When trying to execute addLiquidity on the Uniswap V2 interface, the EVM reverts the transaction. This can happen for several reasons, such as:

• Insufficient liquidity in the wallet.

• Incorrect token balances or addresses.

• Unvalidated external calls (e.g. calling external contract functions).

• Incorrect gas limits.

The Code:

Here is an example Truffle contract and a web3.js code snippet that reproduces the issue:

//send truffle-contracts.js
const Web3 = require('web3');
const truffle = require('trufa');
const Web3 = new Web3(new Web3.providers.HttpProvider("
module.exports = {
providers: [], // No provider specified, causing EVM to rollback the transaction
networks: {
development: {
host: 'localhost',
port: 8545,
hate: 2,000,000
},
address: {network_id: 1}
},
contracts: {
AddLiquidity: require('./AddLiquidity.json')
}
};

//addLiquidity.js
const Web3 = require('web3');
const contract = new Web3.eth.Contract(require.resolve('./AddLiquidity'), '0x...');
contract.methods.addLiquidity(address, quantityIn, quantityOut, price).send({ from: '0x...', value: '0.1' })
.then((result) => {
console.log(result.status);
if (result.status === 'success') {
contract.functions.getBalance.call(address)
.then((balance) => {
console.log(Balances: ${balance});
});
} else {
throw new Error('Error');
}
})
.catch((error) => {
console.error(error);
throw error;
});

Potential solutions:

To resolve this issue, make sure to:

• Specify a provider: Add a providers array with the EVM provider URL (e.g. in your Truffle configuration.

//envia trufa-contracts.js
const Web3 = require('web3');
const truffle = require('trufa');
const Web3 = new Web3(new Web3.providers.HttpProvider("
module.exports = {
providers: [],
networks: {
development: {
host: 'localhost',
port: 8545,
hate: 2,000,000
},
address: {network_id: 1}
},
contracts: {
AddLiquidity: require('./AddLiquidity.json')
}
};

• Validate external calls: Make sure the externalCallfunction is implemented in your contract to validate external transactions.

//addLiquidity.js
const Web3 = require('web3');
const contract = new Web3.eth.Contract(require.resolve('./AddLiquidity'), '0x...');
contract.methods.addLiquidity(address, quantityIn, quantityOut, price)
.call({from: '0x...' })
.then((result) => {
console.log(result.status);
if (result.status === 'success') {
contract.functions.getBalance.call(address)
.then((balance) => {
console.log(Balances: ${balance});
});
} else {
throw new Error('Error');
}
})
.catch((error) => {
console.error(error);
throw error;
});

“javascript

//send truffle-contracts.js

const Web3 = require(‘web3’);

const truffle = require(‘trufla’);

const Web3 = new Web3(new Web3.providers.HttpProvider(“

module.