MockV3Aggregator don't compile

[ghost]

Hello there, I'm at 10:43 hours/minute in the course, it's very good, but now I'm having a problem.
I added the MockV3Aggregator imported from chainlink, but it doesn't compile. So here's the MockV3Aggregator.sol:

pragma solidity ^0.6.0;

import "@chainlink/contracts/src/v0.6/tests/MockV3Aggregator.sol";

And as explained in the course, I need to import that version of the compiler, so I updated my hardhat.config.js as well:

module.exports = {
	// solidity: "0.8.8",
	solidity: {
		compilers: [{ version: "0.8.8" }, { version: "0.6.0" }],
	},

The problem is that now when I run yarn hardhat compile, I get this error:

@chainlink/contracts/src/v0.6/interfaces/AggregatorV2V3Interface.sol:7:38: TypeError: Interfaces cannot inherit.
interface AggregatorV2V3Interface is AggregatorInterface, AggregatorV3Interface
                                     ^-----------------^

@chainlink/contracts/src/v0.6/interfaces/AggregatorV2V3Interface.sol:7:59: TypeError: Interfaces cannot inherit.
interface AggregatorV2V3Interface is AggregatorInterface, AggregatorV3Interface
                                                          ^-------------------^

Error HH600: Compilation failed

It looks like an external problem in the MockV3Aggregator contract, how can I fix this?

[toddteller]

Same problem here.

I solved it by changing the Solidity version from ^0.6.0 to ^0.7.0

// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;

import "@chainlink/contracts/src/v0.7/tests/MockV3Aggregator.sol"; 

Also remember to add the compiler version in hardhat.config.js

module.exports = {
    // solidity: "0.8.8",
    solidity: {
        compilers: [{ version: "0.8.8" }, { version: "0.6.0" }, {version: "0.7.0"}],
    },

[PatrickAlphaC]

Please use:

    solidity: {
        compilers: [{ version: "0.8.8" }, { version: "0.6.6" }],
    },

Or

solidity: {
        compilers: [{ version: "0.8.8" }, { version: "0.6.0" }, {version: "0.7.0"}],
    },