Ethereum: Error: Missing or invalid parameters. Double check you have provided the correct parameters. Even with correct type casting

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Ethereum: Error – Missing or invalid parameters in contract function

As a developer working with Ethereum-based smart contracts, especially with the latest Next.js versions, you may encounter an error that seems surprising at first glance. The error message provided indicates that parameters are missing or invalid when calling a function in a contract. In this article, we will delve into the reasons behind such errors and provide guidance on how to troubleshoot and resolve them.

Why does the error occur?

When writing a function to interact with a smart contract on Ethereum using Next.js, several factors can contribute to the “Missing or invalid parameters” error:

• Incorrect function signature: Make sure that the contractAddress parameter matches the expected format specified by the ABI (Application Binary Interface) of the contract. In most cases, it should be in the format “address:address”.

• Invalid function call syntax: Make sure you are calling the correct function with the correct parameters and order. The Ethereum blockchain API follows a specific structure for calling functions on contracts.

• Missing or incorrect contract interface: The contract’s ABI (Application Binary Interface) file defines the interfaces used by the contract. If your contract has changed since the last ABI update, you may need to update the function call parameters accordingly.

• Contract provider library or SDK mismatch: Using an outdated or incompatible Ethereum library can lead to errors like this.

Troubleshooting steps:

To resolve the error, follow these step-by-step instructions:

Step 1: Check the function signature

• Check that your contract’s ABI file (e.g. abi.json) is properly formatted and matches the expected structure.

• Make sure the function signature in your code matches the ABI file.

Example:

// abi.json
{
"inputs": [],
"name": "My Contract",
"outputs": [],
"stateMutability": "",
"type": ""
}

Step 2: Correct the function call syntax

• Make sure you are calling the correct function with the correct parameters and order. Check your contract provider library or SDK documentation for guidance on how to use the `contractAddressparameter.

• Make sure the function name, return type, and input arguments match the contract ABI file.

Example:

// myContract.js
import { ethers } from 'ethers';
const MyContract = async () => {
// Function call with correct parameters
};

Step 3: Update the contract interface

• If your contract has changed, update the abi.jsonfile to reflect the new ABI.

• Make sure you are using the latest version of the contract provider library or SDK.

Example:

// abi.json
{
"inputs": [],
"name": "My Contract",
"outputs": [],
"stateMutability": "",
"type": ""
}

Step 4: Review and test the code

• Run your application with the updated abi.json` file to verify that the function call was successful.

• Test your contract interactions using a tool like Remix or Truffle Suite.

By following these steps, you should be able to resolve the “Missing or invalid parameters” error when calling functions on Ethereum-based smart contracts in Next.js.