Error in smart contract swapandliquify/swaptokensforeth function

Smart Contracts
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1

Good Day Everyone
i am currently working on a smart contract now i have this error
i am needing some help to fix this

contracts/TheOblivion.sol:645:43: ParserError: OVM: SELFBALANCE is not implemented in the OVM. (We have no native ETH -- use deposited WETH instead!) _tLiquidTotal = _tLiquidTotal.add(address(this).balance); ^-------------------^
contracts/TheOblivion.sol:646:42: ParserError: OVM: SELFBALANCE is not implemented in the OVM. (We have no native ETH -- use deposited WETH instead!) TransferLiquidETH(liquidAddress, address(this).balance); ^-------------------^

    function swapAndLiquify(uint256 contractTokenBalance) private lockTheSwap {
        swapTokensForEth(contractTokenBalance); 
        _tLiquidTotal = _tLiquidTotal.add(address(this).balance); 
        TransferLiquidETH(liquidAddress, address(this).balance);
    }

    function swapTokensForEth(uint256 tokenAmount) private {
        // generate the uniswap pair path of token -> weth
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = uniswapV2Router.WETH();

        _approve(address(this), address(uniswapV2Router), tokenAmount);

        // make the swap
        uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0, // accept any amount of ETH
            path,
            address(this), // The contract
            block.timestamp
        );
    }
2

this forum so inactive or is this just a error no one can solve?

4

Please restrain yourself from negative comments, forum activity is easily surveyable by looking at the front page. Also, this category is for OpenZeppelin products support only, so I'm moving it to the #smart-contracts category -- please be mindful of it next time and you'll have a better experience using the forum.

As of your question, the problem is that you're trying to check ether balances in a chain without a native currency. Refer to Optimism's documentation for more details.

Update: apparently they're planning to remove the ERC20 interface altogether.