How do I fix this issue?
The 0x5f4e... address hardcoded in your getVersion() function doesn't hold any smart contract on the Kovan testnet (link). Even though it has a contract deployed on the mainnet, these environments are separated.
When there's no smart contract on the address, there's nothing to send a response to the internal call. Your code expects an uint256 response from the version() call, so that it can return it from the getVersion().
When it doesn't receive the expected response, it throws an exception, effectively reverting the "main" call.
/ SPDX-License-Identifier: MIT
pragma solidity >=0.6.6 <0.9.0;
interface AggregatorV3Interface {
function decimals()
external view returns (
uint8
);
function description()
external view returns (
string memory
);
function version()
external view returns (
uint256
);
// getRoundData and latestRoundData should both raise "No data present"
// if they do not have data to report, instead of returning unset values
// which could be misinterpreted as actual reported values.
function getRoundData(
uint80 _roundId
)
external view returns (
uint80 roundId,
int256 answer,
uint256 startedAt,
uint256 updatedAt,
uint80 answeredInRound
);
function latestRoundData()
external view returns (
uint80 roundId,
int256 answer,
uint256 startedAt,
uint256 updatedAt,
uint80 answeredInRound
);
}
contract FundMe {
mapping(address =>uint256) public addressToAmountFunded;
function fund() public payable {
addressToAmountFunded[msg.sender] += msg.value;
//What the eth --> usd conversion rate
}
function getVersion() public view returns (uint256) {
AggregatorV3Interface priceFeed = AggregatorV3Interface(0x8A753747A1Fa494EC906cE90E9f37563A8AF630e);
return priceFeed.version();
}
}