// execute callback
IFlashReceiver(msg.sender).flashCallback(_pools, _amts, _data);
// check pool balance after callback
for (uint i; i < _pools.length; i = i.uinc()) {
	_require(IERC20(tokens[i]).balanceOf(_pools[i]) >= balanceBefores[i], Errors.INVALID_AMOUNT_TO_REPAY);
}
// check that flash is enabled
_require(poolConfig.canFlash, Errors.FLASH_PAUSED);
 /// @inheritdoc IConfig
    function setModeStatus(uint16 _mode, ModeStatus calldata _status) external onlyGuardian {
        _require(_mode != 0, Errors.INVALID_MODE);
        __modeConfigs[_mode].status = _status;
        emit SetModeStatus(_mode, _status);
    }
