    function initialize(address cnoteAddr, address oracleAddress) external {
        if (msg.sender != admin ) {
            revert SenderNotAdmin(msg.sender);
        }   
        address oldPriceOracle = address(oracle);
        cNote = CErc20(cnoteAddr);
        oracle = PriceOracle(oracleAddress);
        emit NewPriceOracle(oldPriceOracle, oracleAddress);
    }
