Ethereum: TransactionRevertInstructionError: Transaction has been reverted by the EVM

Ethereum Transaction RevertInstructionError: Transaction has been reverted by the EVM

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

The issue:

When attempting to run addLiquidity on the Uniswap V2 interface, the EVM reverts the transaction. This can happen for various reasons, such as:

• Insufficient liquidity in the pool.

• Incorrect token balances or addresses.

• Unvalidated external calls (e.g. calling functions from external contracts).

• Incorrect gas limits.

The code:

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

// seolia-truffle-contracts.js
const Web3 = require('web3');
const truffle = require('truffle');
const Web3 = new Web3(new Web3.providers.HttpProvider("
module.exports = {
providers: [], // No provider specified, causing EVM to cancel the transaction
networks: {
development: {
host: 'localhost',
port: 8545,
gas: 2000000
},
seolia: { network_id: 1 }
},
contract: {
AddLiquidity: require('./AddLiquidity.json')
}
};

// addLiquidity.js
const Web3 = require('web3');
const contract = new Web3.eth.Contract(require.resolve('./AddLiquidity'), '0x...');
contract.methods.addLiquidity(address, amountIn, amountOut, 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;
});

Possible solutions:

To fix this issue, make sure to:

• Specify a provider: Add a providers array with the URL of the EVM provider (for example, in your Truffle configuration.

// seolia-truffle-contracts.js
const Web3 = require('web3');
const truffle = require('truffle');
const Web3 = new Web3(new Web3.providers.HttpProvider("
module.exports = {
providers: [],
networks: {
development: {
host: 'localhost',
port: 8545,
gas: 2000000
},
seolia: { network_id: 1 }
},
contract: {
AddLiquidity: require('./AddLiquidity.json')
}
};

• External Call Validation: Make sure that 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, amountIn, amountOut, 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

// seolia-truffle-contracts.js

const Web3 = require(‘web3’);

const truffle = require(‘truffle’);

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

module.

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