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Metamask: invalid opcode: opcode 0x4b not defined when sending a new contract

Published by Terlumun Aondover on February 10th, 2025.

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Understanding Etherscan Errors with Metamask and Smart Contracts

As a growing number of projects take advantage of the Ethereum blockchain, deploying smart contracts increagly popular. However, every now and then, you encounter an error message that can be frustrating to understand. One such issue is encountered by many users when using metamask for deploying new contracts on the Ethereum Network.

In this article, we’ll explore what the invalid opcode: opcode 0x4b not defined warning means and why it occurs. We’ll also provide some tips on how to resolve

What is Metamask and Etherscan?

Metamask is a popular web application that allows users to interact with the Ethereum blockchain without needing to install an entire full full node setup. It provides a user-friendly interface for transferring ether (ETH), sending transactions, and inspecting block data on the Ethereum Network.

Etherscan is a web-based platform for exploring and analyzing smart contract executions on the Ethereum testnet or mainnet. With etherscan, you can view

Invalid Opcode: Opcode 0x4b Not Defined Error

When a user tries to deploy a new contract using Metamask’s Deploy Function

WARNING! Error Encountered During Deployment

Invalid Opcode: Opcode 0x4b Not Defined

`

This warning occurs when the Ethereum virtual machine (EVM) Encounters an invalid opcode for the deploy function. The EVM is responsible for executing instructions on the blockchain, and it uses a specific set of opcodes to perform various actions.

0x4b opcode is not defined in the evm’s opcode table. Invalid process.

What causes the invalid opcode: opcode 0x4b not defined error?

The 0x4b opcode is a specific instruction used by the evm for deploying contracts using thedeploy function. The most common reason for encountering

Here are some possible causes of this error:

* Incompatible bytecode

: the deployed contract’s bytecode may not match the evm’s expected opcode table.

* Invalid opcode usage : the contract’s code might use an invalid or unsupported opcode, which is not recognized by the evm.

.

How to Resolve The Error

Opcode: Opcode 0x4b not definederror and successfully deploy your new contract using metamask, follow these steps:




Ethereum versions.


2.


 Test with a compatible testnet Node : Test your contract deployment on a surepate testet Node, such as rinkeby or ropsten, to value that the issue persists.


4.

Invalid Opcode: Opcode 0x4b not defined` Error and successfully Deploy new contracts using metamask on the Ethereum Network.

Solana Balance