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

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

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 take a closer look at this error and provide some tips on how to resolve it.

Error Details

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

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

This message suggests that the verify function in your smart contract encountered an error during execution. More specifically, it tells you that an unexpected data mismatch occurred when sending arguments to the verify method.

Error Breakdown

Let’s take a closer look at the error message:

• [ See: ]: This line links to a specific page in the Ethers.js documentation that details how to handle errors related to calling methods in smart contracts. Specifically, the exception revert, which is triggered when an error occurs during a method call.

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

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

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

Resolving the Error

To resolve this issue, you can try the following:

• Check the transaction data: Make sure that the transaction contains all required fields and parameters.

• Check your contract function signature: Double check the signature of the verify function to make sure it accepts valid argument types (string and bytes).

• Use the verify method with a valid address: When calling the verify method, make sure you pass a valid address as an argument.

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

In this example, we created a simple TestContract contract that uses the verify method to verify messages. Then we deployed the contract to the Ethereum network and called the verify function.