Metamask: Metamask shows an error, but works from the console.

Metamask Error: Contract Code Not Validated

As a developer working with smart contracts on the Ethereum blockchain, you have likely encountered issues when deploying and interacting with your contracts. One of the most frustrating experiences is when your contract code fails to validate properly in both the web-based development environment (web3.js) and the Metamask mobile app wallet.

In this article, we will explore the issue you are experiencing and provide a step-by-step guide on how to resolve it using console output from Metamask.

The Problem: Contract Code Error in Metamask Console

When you try to call your contract to deposit money to itself in the MetaMask console environment, you encounter an error that displays Contract Code Validation Issues. This is not typical behavior for most contracts, as they are expected to validate their code correctly.

To solve this problem, let’s look at the web3.utils.toWei() function and what could be causing the problem:

let ethAmount = this.web3.utils.toWei(...); // error: invalid argument type

In your case, it looks like you are trying to convert the Ethereum amount from wei (a unit of ether) to a standard decimal representation. However, there is a problem with the second argument passed to toWei().

Possible causes and solutions

• Incorrect function signature: Make sure the function signature in your contract is correct:

function depositAmount(etherAmount: uint256) public {
// ...
}

• Invalid or missing arguments

  

  : Make sure you included all the required arguments when calling depositAmount(). Make sure the second argument (etherAmount) matches the expected type.

• Type inference errors: Ethereum’s toWei() function requires specific types for its arguments. If your contract is written in Solidity, make sure it uses the correct types:

function depositAmount(ethereumAmount: uint256) public {
// ...
}

Workarounds

To work around this issue, you can try one or more of the following:

• Add type annotations: If your contract is written in Solidity (for example, .sol), add type annotations for the etherAmount argument:

function depositAmount(ethereumAmount: uint256) public {
// ...
}

• Use a more robust contract validation library: Consider using libraries like contract-validation or OpenZeppelin’s eip172 to validate your contract code and avoid type errors.

Conclusion

To resolve the issue of contract code validation errors in Metamask, make sure your contract is written with the correct function signatures, includes all required arguments, and uses the expected types. If you still encounter issues after trying these solutions, please provide additional context or code snippets related to your project and I will do my best to help you further.

Example Use Case

Here is an updated example of how you can use web3.utils.toWei() with type annotations:

pragma solidity ^0.8.0;
contract DepositAmount {
function depositAmount(ethereumAmount: uint256) public {
require(ethereumAmount != 0, "Invalid amount");
// ...
}
}

Note that this is just a basic example and may not cover all edge cases. Be sure to carefully test your contract in both the web-based development environment (web3.js) and the mobile app’s Metamask wallet.