Do not use(be careful) getAuction from ClockAuction.

[hackfisher]

The return type and return value type is mismatch.

    function getAuction(uint256 _tokenId)
    public
    view
    returns
    (
        address seller,
        uint256 startedAt,
        uint256 duration,
        uint256 startingPrice,
        uint256 endingPrice,
        address token,
        uint128 lastRecord,
        address lastBidder,
        uint256 lastBidStartAt,
        address lastReferer
    ) {
        Auction storage auction = tokenIdToAuction[_tokenId];
        return (
            auction.seller,
            auction.startingPriceInToken,
            auction.endingPriceInToken,
            auction.duration,
            auction.startedAt,
            auction.token,
            auction.lastRecord,
            auction.lastBidder,
            auction.lastBidStartAt,
            auction.lastReferer
        );
    }