Metamask: Error data=0x when trying to send arguments to a function in smart contract

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Metamask Error: “Data error = 0x when trying to send arguments to a function in a smart contract”

As a Metamask user, you may encounter an unexpected error message when trying to interact with your Ethereum wallet or smart contracts. In this article, we will delve into the details of the error and provide tips on how to resolve it.

Error Details

The error message indicates that there is a problem with the data sent to a function in your smart contract. The exact syntax and context is as follows:

Error: Call reset exception [See: (method="verify(string,bytes)", data="0x", errorArgs=null, errorName=...

This message suggests that your smart contract’s „verify“ function is experiencing a runtime error. Specifically, it indicates that a data mismatch occurred when passing arguments to the „verify“ method.

Error Analysis

Let’s analyze the error message:

• [See: This line takes you to an Ethers.js-specific documentation page that details how to handle errors related to calling methods in smart contracts. In particular, it mentions the "revert" exception, which is raised when an error occurs during method calls.

• (method=“verify(string,bytes)“):: The first part of the string refers to a specific method call on your smart contract (in this case, theverifyfunction).

• (data=“0x“): Specifies that the data sent is a hexadecimal-encoded address (0x).

• (errorArgs=null, errorName=…): The last two parts of the string specify the context of the error.errorArgsis set tonull, meaning that no additional arguments were passed to the method. RegardingerrorName, it seems that it is not a standard attribute in the Ethers.js documentation.

• Verify contract function signature: Double-check the signature of theverifyfunction to confirm that it accepts the correct argument types (string and byte).

• Use theverifymethod with the correct address: When calling theverify` method, make sure you pass the correct address as an argument.

• Verify your contract ABI: Make sure your smart contract’s ABI (Application Binary Interface) is up to date and accurately reflects the function calls.

Example use case

To illustrate how to resolve this error, let’s create a simple example:

pragma solidity ^0.8.0;
TestContract contract {
function verify(memory string _message) public {
// Verify the message using the contract address
require(_message.length == 32 && _message != "Hello", "Invalid message length or content");
return true ;
}
}
// Deploy the contract to a new Ethereum network
pragma solidity ^0.8.0;
contractDeployer {
public contract addressAddress;
constructor() {
// Use the Ethers.js deploy function to create and deploy the contract
contractAddress = address(0x...); // Replace with your actual contract distribution code
deployContract(contractAddress);
}
function deployContract(address _address) internal {
// Deploy a new contract instance using Ethers.js deploy function
// This will automatically initialize the contract with the specified address and ABI
}
}

In this example, we created a simple „TestContract“ contract that uses a „verify“ method to verify a message. We then deployed the contract to an Ethereum network and called the „verify“ function.

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