Lesson 14: No arguments passed to the base constructor. Specify the arguments or mark "RandomIpfsNft" as abstract.

[Charlotte528]

Hi! I use the example code from the github for my RandomIpfsNft contract. But my Vscode is keep complaining that"No arguments passed to the base constructor. Specify the arguments or mark "RandomIpfsNft" as abstract." I don't know where is the problem. Could anyone help me to solve this. Here's my github link: https://github.com/Charlotte528/hardhat-NFT Thanks so much!!!

[Nlferu]

Hi @Charlotte528

I assume error comes from following package "@nomiclabs/hardhat-ethers" in your repository if you do below:
"@nomiclabs/hardhat-ethers": "npm:hardhat-deploy-ethers@^0.3.0-beta.13" -> this will be specific hardhat ethers version
If you do following:
"@nomiclabs/hardhat-ethers": "npm:hardhat-deploy-ethers", -> this is latest hardhat ethers for which syntax is different

As ethers v5 and v6 has different syntax that might be issue, so please update packages to "npm:hardhat-deploy-ethers@^0.3.0-beta.13"

I have already created pull request for this to course repo.

[Charlotte528]

(It works now! Just ignore this. Thank you so much!!!)

Hi! @Neftyr Thanks for your kind reply! I already updated to "npm:hardhat-deploy-ethers@^0.3.0-beta.13", but the problem still exists.

[Nlferu]

Hi @Charlotte528

Have you totally removed node_modules folder before reinstalling packages? I have seen your repository and it is clear copy of course repo, so there is no chance something is wrong with the code. You can also check imported contracts (contracts you are importing to your RandomIpfsNft contract) if their versions are the same as course ones as there could be changes in their constructor arguments and that can be the issue here also.

[Nlferu]

Hi @Charlotte528

Seems like I found issue. Ownable contract got updated, look below:

    /**
     * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
     */
    constructor(address initialOwner) {
        if (initialOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(initialOwner);
    }

So you need to pass initial owner in your contract now or downgrade openzeppelin contracts.

Here is your yarn.lock file:

so you are using version 4.9.3 and course is using 4.7.3.

To follow course without adjusting your contract you should do below:

1. Clone course repo and install dependencies -> course file yarn.lock will ensure you have same packages versions
2. Downgrade openzeppelic contracts version to 4.7.3

[Charlotte528]

Oh, I already fixed this issue. I added to my reply but I should make it clearer. Sorry for this misunderstanding. But thanks anyway. Have a good day!

[Nlferu]

Ahh no problem :D glad I could help cheers!