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TransferHelper: TRANSFER_ FROM_ FAILED

2022-02-03 20:42:52 【Q & A of Denglian community】

Contract published on bsc Test chain , stay https://test-swap.pinksale.finance/#/pool Release liquidity , Use uniswap Report an error when selling tokens TransferHelper: TRANSFER_FROM_FAILED, How to solve this problem ？ sell token Code for ：

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        );    }


Take the answer 1：

TRANSFER_FROM_FAILED Usually without authorization , Or not enough .

Do you have tokens in your contract ？



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