Advanced Foundry (Stableboin) - Module 12 / "Cannot instantiate an abstract contract."

[MadAudit]

Hi everyone

Before I start, wishing everyone a Happy and successful new year.

I am currently going through the StableCoin part of the Advanced Foundry course and am trying to deploy the corresponding script.
I have created the DeployDSC.s.sol file but am unable to compile as I get a "Cannot instantiate an abstract contract". The 2 contracts I am trying to instantiate are DecentralizedStableCoin and DSCEngine.
I have tried debugging the code but am stuck on the 2 points below:

1. I understand the error as DecentralizedStableCoin.sol contains the word "abstract". Patrick's code doesn't but if I remove this keyword from my code, I get an error.
2. DSCEngine doesn't have the word abstract but still throws me the same error.

I do have some functions that aren't implemented so makes sense but why am I not able to compile like Patrick did?

DeplyDSC script:
function run() external returns (DecentralizedStableCoin, DSCEngine) {
vm.startBroadcast();
DecentralizedStableCoin dsc = new DecentralizedStableCoin();
DSCEngine engine = new DSCEngine();
vm.stopBroadcast();
}

DecentralizedStableCoin contract declaration:
abstract contract DecentralizedStableCoin is ERC20Burnable, Ownable

DSCEngine contract declaration:
contract DSCEngine is ReentrancyGuard {

Has anyone ever encountered this error?

Please let me know if you need more info.

Thanks.

[EngrPips]

Hello, Why does your DecentralizedStableCoin.sol contain the abstract keyword and Patrick's code does not, Are you not coding along with him?

[EngrPips]

Have you checked the chronological-update tab https://github.com/Cyfrin/foundry-full-course-cu/blob/main/chronological-updates.md of the course GitHub repo to see if there have been updates for the section?

[MadAudit]

Thank you, I will do that.

I think I am having a versioning issue. When I imported my external libraries earlier on (I believe openzeppelin), it required version 0.8.20. When I change my version to 0.8.19 and remove the "abstract"word, I can compile but am getting incompatible version errors. I am going to do some more debugging by going through the link you have provided and by exploring the versioning issue path.

[EngrPips]

I believe this issue has been addressed in the chronological-update tab of the course GitHub repo.

[MadAudit]

Thank you, it has. I re-installed the version as per the chronological updates notes and updated my files accordingly.
Now I just need to debug my failing tests, fun times lol.
Thank you very much for all your help, really appreciate it.

[EngrPips]

Anytime, Friend. Keep crushing it.

[MadAudit]

Issue resolved.