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I created a new ERC20 token and I'm trying to create a new pool ETH pair with my token on Uniswap V2. However, when I get to the last step on Uniswap and press "Add" it doesn't do anything. When I look at my browser console I see the following errors:

Object { code: -32603, message: "execution reverted: TransferHelper: TRANSFER_FROM_FAILED", data: {…} }

and I also get

Error: cannot estimate gas; transaction may fail or may require manual gas limit

Can anyone help me? My contract can be found here: https://etherscan.io/address/0x0c6891f1bbc03805585d70b2170d9e84dbceee00#code#L646

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  • I'm running into the same problem. I'll post back here if I solve it.
    – Josh C
    Feb 13, 2022 at 4:19
  • Hey, sorry I never posted a update, but I was able to fix it by adding a APPROVE in the thransferFrom function. I'm on mobile at the moment, but I cant add a more elegant solution for you when I get to my PC.
    – Baddack
    Feb 14, 2022 at 6:42

2 Answers 2

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In my TransferFrom function I added the following and it resolved my issue.

if (currentAllowance != type(uint256).max) 
{
    require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
    
    unchecked
    {
        _approve(sender, _msgSender(), currentAllowance - amount);
    }
}
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You can try by approving the contract and then do TranasferFrom().

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