ParseError: Source file requires different compiler , when using chainlink-brownie-contracts - ethereum

Question

I'm trying to implement PatrickAlpha NFT implementation Github. When I followed readme instructions, collectibles are minted correctly. But If I tried to change anything in the code , it gives me error like this.
Compiling contracts...
Solc version: 0.6.6
Optimizer: Enabled Runs: 200
EVM Version: Istanbul
CompilerError: solc returned the following errors:
/Users/batuhansesli/.brownie/packages/smartcontractkit/chainlink-brownie-contracts#1.0.2/contracts/src/v0.6/VRFConsumerBase.sol:2:1: ParserError: Source file requires different compiler version (current compiler is 0.6.6+commit.6c089d02.Darwin.appleclang - note that nightly builds are considered to be strictly less than the released version
pragma solidity 0.6.0;
^--------------------^
For debug, I tried to change only ERC721 constructor parameters, but error occured again.
Original Code:
pragma solidity 0.6.6;
import "#openzeppelin/contracts/token/ERC721/ERC721.sol";
import "#chainlink/contracts/src/v0.6/VRFConsumerBase.sol";
contract AdvancedCollectible is ERC721, VRFConsumerBase {
uint256 public tokenCounter;
enum Breed{PUG, SHIBA_INU, ST_BERNARD}
// add other things
mapping(bytes32 => address) public requestIdToSender;
mapping(bytes32 => string) public requestIdToTokenURI;
mapping(uint256 => Breed) public tokenIdToBreed;
mapping(bytes32 => uint256) public requestIdToTokenId;
event requestedCollectible(bytes32 indexed requestId);
bytes32 internal keyHash;
uint256 internal fee;
constructor(address _VRFCoordinator, address _LinkToken, bytes32 _keyhash)
public
VRFConsumerBase(_VRFCoordinator, _LinkToken)
ERC721("Dogie", "DOG")
{
tokenCounter = 0;
keyHash = _keyhash;
fee = 0.1 * 10 ** 18;
}
function createCollectible(string memory tokenURI, uint256 userProvidedSeed)
public returns (bytes32){
bytes32 requestId = requestRandomness(keyHash, fee, userProvidedSeed);
requestIdToSender[requestId] = msg.sender;
requestIdToTokenURI[requestId] = tokenURI;
emit requestedCollectible(requestId);
}
function fulfillRandomness(bytes32 requestId, uint256 randomNumber) internal override {
address dogOwner = requestIdToSender[requestId];
string memory tokenURI = requestIdToTokenURI[requestId];
uint256 newItemId = tokenCounter;
_safeMint(dogOwner, newItemId);
_setTokenURI(newItemId, tokenURI);
Breed breed = Breed(randomNumber % 3);
tokenIdToBreed[newItemId] = breed;
requestIdToTokenId[requestId] = newItemId;
tokenCounter = tokenCounter + 1;
}
function setTokenURI(uint256 tokenId, string memory _tokenURI) public {
require(
_isApprovedOrOwner(_msgSender(), tokenId),
"ERC721: transfer caller is not owner nor approved"
);
_setTokenURI(tokenId, _tokenURI);
}
}
My Code :
pragma solidity 0.6.6;
import "#openzeppelin/contracts/token/ERC721/ERC721.sol";
import "#chainlink/contracts/src/v0.6/VRFConsumerBase.sol";
contract FootballerCollectible is ERC721, VRFConsumerBase {
bytes32 internal keyHash;
uint256 public fee;
uint256 public tokenCounter;
enum Player{MBAPPE, NEYMAR, MESSI, RONALDO}
mapping (bytes32 => address) public requestIdToSender;
mapping (bytes32 => string) public requestIdToTokenURI;
mapping (uint256 => Player) public tokenIdToPlayer;
event requestedCollectible(bytes32 indexed requestId);
constructor(address _VRFCoordinator, address _LinkToken, bytes32 _keyhash) public
VRFConsumer(_VRFCoordinator, _LinkToken)
ERC721("Footballer", "FTC")
{
keyHash = _keyhash;
fee = 0.1 * 10 ** 18;
tokenCounter = 0;
}
function createCollectible(uint256 userProvidedSeed, string memory tokenURI)
public returns (bytes32) {
bytes32 requestId = requestRandomness(keyHash, fee, userProvidedSeed);
requestIdToSender[requestId] = msg.sender;
requestIdToTokenURI[requestId] = tokenURI;
emit requestedCollectible(requestId);
}
function fulfillRandomness(bytes32 requestId, uint256 randomNumber) internal override{
address cardOwner = requestIdToSender[requestId];
string memory tokenURI = requestIdToTokenURI[requestId];
uint256 newItemId = tokenCounter;
_safeMint(cardOwner, newItemId);
_setTokenURI(newItemId, tokenURI);
Player player = Player(randomNumber % 4);
tokenIdToPlayer[newItemId] = player;
requestIdToTokenId[requestId] = newItemId;
tokenCounter = tokenCounter + 1;
}
function setTokenURI(uint256 tokenId, string memory _tokenURI) public {
require(
_isApprovedOrOwner(_msgSender(), tokenId),
"ERC721: transfer caller is not owner nor approved"
);
_setTokenURI(tokenId, _tokenURI);
}
}

Answer 1

Hi :) In the Error message that you received
Blockquote ParserError: Source file requires different compiler version (current compiler is 0.6.6+commit.6c089d02.Darwin.appleclang - note that nightly builds are considered to be strictly less than the released version
pragma solidity 0.6.0;
it says that you are trying to compile your contract with a different version of pragma solidity. The smart contract in question is:
[https://github.com/smartcontractkit/chainlink-brownie-contracts/blob/main/contracts/src/v0.6/VRFConsumerBase.sol]
which is using
pragma solidity ^0.6.0;
You are specifying to use version 0.6.6 in your contract which is later than the selected compiler. To get around this, you can either drop down to ^0.6.0 or you can change your pragma to
pragma solidity ^0.6.0;
For more information, you can read this ticket