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TransferHelper: TRANSFER_FROM_FAILED

 2 years ago
source link: https://learnblockchain.cn/question/2900
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TransferHelper: TRANSFER_FROM_FAILED

TransferHelper: TRANSFER_FROM_FAILED

合约发布在bsc测试链，在https://test-swap.pinksale.finance/#/pool发布流动性，
使用uniswap卖代币的时候报错TransferHelper: TRANSFER_FROM_FAILED，这个问题怎么解决？
卖token的代码：

function _swapTokensForBnb(uint256 tokenAmount) public {
        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,
            path,
            address(this),
            block.timestamp
        );
    }

report

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