    function initialize(address router, address admin, address withdrawer, address feeTaker, address[] calldata whitelistedNfpms) public virtual {
        require(!_initialized);
        if (withdrawer == address(0)) {
            revert();
        }
        require(msg.sender == _initializer);

        _grantRole(ADMIN_ROLE, admin);
        _grantRole(DEFAULT_ADMIN_ROLE, admin);
        _grantRole(WITHDRAWER_ROLE, withdrawer);
>>      _grantRole(DEFAULT_ADMIN_ROLE, withdrawer);
        ---SNIP---
    }
