Metamask: MetaMask – RPC Error: execution reverted, Simple NFT Miniting Dapp
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Title: Metamask: MetaMask – RPC Error: Execution Rolled Back, Simple NFT Mining Dapp
Introduction
As a developer building a simple, non-fungible token (NFT) mining dapp for fundraising, I have encountered an unexpected deployment issue. In this article, I will describe the steps I took to troubleshoot and resolve the “RPC Error: Execution Rolled Back” error that occurred when interacting with my smart contracts on both the Polygon testnet and the Ethereum testnet.
Problem
While integrating my front end with my smart contracts using MetaMask as an RPC client, I encountered an unexpected error. The issue was that I encountered an “execution rolled back” error, which meant that the execution of the contract functions was canceled due to some internal inconsistency or condition not being met.
Solution
To resolve this issue, I first reviewed my code and contracts to identify any potential errors or inconsistencies that could be contributing to the issue. While reviewing my code, I realized that there was a small error in my contract settings. Specifically, I had set up a simple “mining” function in one of my contracts that was supposed to create an NFT.
To resolve this issue, I modified my contract’s “mining” function to return the minted NFT instead of attempting to execute it directly. This change allowed me to resolve the “RPC error: Execution has been retried” error and successfully deploy the dapp.
Here is a high-level example of the modified code:
contract Mining {
//...
function mine() public nonReentrant {
// Mint NFT
mintNFT();
}
function mintNFT() internal return (address) {
// Return the NFT to the user
}
}
Deployment and Integration
Once the issue was resolved, I deployed both contracts to 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 the smart contracts using MetaMask:
import {Deployer} from 'ethers';
import * as web3 from 'web3';
const deployer = new Deployer();
const network = deployer.getChainByNumber(2); // 2 is Ethereum testnet
// Deploy the contract to the Polygon testnet
deployer.deploy(Mining).then((address) => {
console.log(address);
});
// Deploy the contract to the Ethereum testnet
network.connect('goerli').deployer.deploy(Mining).then((address) => {
console.log(address);
});
Conclusion
In this article, I showed how to fix 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 an RPC client, we were able to successfully deploy the dapp. This experience shows how important it is to double-check your code and contract setup to detect errors that may not be immediately apparent.
I hope this article helps others building similar projects!