下面是pancake的源码,怎么我编译的时候提示不能转换

function pairFor1(
        address factory,
        address tokenA,
        address tokenB
    ) internal pure returns (address pair) {
        (address token0, address token1) = sortTokens(tokenA, tokenB);
        pair = address(
            uint256(
                keccak256(
                    abi.encodePacked(
                        hex"ff",
                        factory,
                        keccak256(abi.encodePacked(token0, token1)),
                        hex"00fb7f630766e6a796048ea87d01acd3068e8ff67d078148a3fa3f4a84f69bd5" // init code hash
                    )
                )
            )
        );
    }