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Title: Metamask: MetaMask – RPC Error: Execution Returned, Simple NFT Mining Decentralized App
Introduction
As a developer creating a simple non-fungible token (NFT) to raise funds, I encountered an unexpected issue with my implementation. In this article, I will describe the steps I took to fix the “RPC Error: Execution Reversed” error that occurred when interacting with my smart contracts on both the Polygon testnet and the Ethereum testnet.
Issue
When integrating my front-end with my smart contracts, using MetaMask as the RPC client, I encountered an unexpected error. The issue caused me to encounter an “execution reversed” error, which meant that the execution of the contract functions was aborted due to an internal inconsistency or unmet condition.
The Solution
To resolve this issue, I first examined my code and contracts for any errors or inconsistencies that could be contributing to the problem. After reviewing my code, I realized that there was a small error in my contract setup. Specifically, I set up a simple “mining” function in one of my contracts, which was supposed to create an NFT.
To fix this issue, I modified my contract’s “mining” function to return the created NFT instead of trying to execute it directly. This change allowed me to resolve the “RPC Error: Execution Reverted” error and successfully deploy the dapp.
Here is a high-level example of the modified code:
“solidity
Contract Mining {
// …
public non-reentrant function mint() {
// NFT coin
mintNFT();
}
internal function mintNFT() returns (address) {
// Return the NFT to the user
}
}
Implementation and Integration
With the problem solved, we deployed both contracts on the Polygon testnet and the Ethereum testnet. On the testnet, I used MetaMask as an RPC client to interact with my smart contracts.
Here is an example of how I integrated my front-end with smart contracts using MetaMask:
``javascript
import { Deployer } from 'ethers';
import * as web3 from 'web3';
const deployer = new Deployer();
const network = deployer.getChainByNumber(2); // 2 represents the Ethereum testnet
// Deploy the contract on the Polygon testnet
deployer.deploy(Mining).then((address) => {
console.log(address);
});
// Deploy the contract on the Ethereum testnet
net.connect('goerli').deployer.deploy(Mining).then((address) => {
console.log(address);
});
Conclusion
In this article, I demonstrated how to resolve an unexpected error “RPC Error: Execution returned” that occurred when interacting with my smart contracts on both the Polygon testnet and the Ethereum testnet. By modifying the “mining” function in one of my contracts and using MetaMask as the RPC client, we were able to successfully deploy the dapp. This experience highlights the importance of double-checking code and contract configuration to catch errors that may not be immediately obvious.
I hope this article helps others building similar projects!
