Lesson 4 - VM error: revert

[guilleigmu]

So I've been facing the following error all day and I suspect it has something todo with the AggregatorV3Interface priceFeed variable:

As you can see in the logs, I'm even sending 4 ETH (in the Javascript VM, so I own 100ETH) but it keeps throwing the error no matter what I try. I think the error is not coming from the require, because it should appear the "You need to spend more ETH!" string in the logs, but it doesn't.

All my contracts compile perfectly. In fact, I've copied the code from Patrick's repository and still doesn't work. The funny thing is that the getVersion function also throws the same error, hence I believe this has something to do with the chainlink interface implementation.

Both functions are using the AggregationV3Interface to get the priceFeed.

• fund() function is using it when msg.value.getConversionRate() is called)
• getVersion() uses it straight forward.

The rest of the functions and getters are working without issues.

Did something change regarding the chainlink implementation?

import "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";

  function fund() public payable {
      require(msg.value.getConversionRate() >= MINIMUM_USD, "You need to spend more ETH!");
      // require(PriceConverter.getConversionRate(msg.value) >= MINIMUM_USD, "You need to spend more ETH!");
      addressToAmountFunded[msg.sender] += msg.value;
      funders.push(msg.sender);
  }

I can copypaste the whole code if you want, but I repeat, I'm using the exact same contracts as in Patrick's repository

Can someone enlighten me on what is going on?
Thanks in advance!

[RoboCrypter]

@guilleigmu Are you funding in terms of WEI ? or in ETH, If you are funding in ETH you have to convert it into WEI that same amount.

[RoboCrypter]

@guilleigmu : I got it you have to deploy in on Injected provider

[RoboCrypter]

@guilleigmu : It will not work in JavaScript VM because you are using Chainlink price feeds

Just deploy it on Injected Provider - Metamask.

And your issue will resolved!

[guilleigmu]

OMG... I feel like an idiot lol. It works.

Yeah my first try was to deploy on Rinkeby and something was not working properly so I decided to debug in the Javascript VM. I found some wrong stuff in my code and solved it, but I kept trying to make it work in the JVM instead of deploying again to the Injected provider...

So yeah, thank you very much sir @abossofmyself.

[RoboCrypter]

@guilleigmu : Look at that : 👍

[RoboCrypter]

@guilleigmu : Kindly mark the answer as answered! ThankYou

Have a good one!