我遇到错误：“收件箱”——“未定义”的参数数量无效。 得到 0 预期 1

Question

I am writing a simple smart contract namely 'inbox.sol'. I am using truffle framework to test and deploy it to the rinkeby network using Infura API. I am having this error. Please help. I'm a beginner.

This is deployed contract in migration

This is my smart contract code

error i got

Answer 1

Your contract has a constructor and expects an argument.

constructor(string memory initialMessage) public {
        message = initialMessage;
    }

So when you deploy it you have to pass an argument.

const Inbox = artifacts.require("Inbox");

module.exports = function (deployer) {
  // passing an argument 
  deployer.deploy(Inbox, "myInitialMessage");
};